Hi, I would like to give a history as to what caused the problem in the first place. I had a dual boot of Windows XP and Windows 7 on my computer. Another computer which I was trying to install XP on was refusing to install so I checked online if the internal hard disk from this could be attached to my computer with an adapter as an external drive and used to install XP and some MORON had said YES on a forum and that it is possible! Boy was I wrong in trusting so! I skeptically tried and as Luck would have it, it returned a blue screen error and then caused my Dual boot to get corrupted in the bargain. All chaos began here.
When I tried to reboot after removing the failed setup, I guess it was still going back to the Setup part and trying to find the other hard disk and not recognizing the boot sector of my own hard disk that contained the dual boot OS' and failed to start up. Turns out the problem for the files not copied error was a faulty RAM on the other system(YES RAM) of all things no connection at all between files not getting copied from the CD whereas it went through on one try from my system! 😱
So I succeeded in changing the Ram and getting that system installed. The problem is on my computer I tried repairing my installations to boot up and all I managed to get was despite failing Startup Recovery several Tries was a Recovered start of Windows 7 whereas there was no way in getting XP to boot. Whatever I try, it either goes to an NTLDR 0x00### whatever error and that's about it. Repair install does not happen as it only gives the option to install fresh in XP. I tried the FIXMBR, FIXBOOT, through Windows Recovery all in vain and even tried the Hirens and UBCD4WIN which didn't seem to help much. Guess you have to know which program to use and how and any wrong move can mean death to the PC.
What I want to know is if there is any way of rewriting the MBR or boot.ini/bootmgr/bootsector to recognize the Windows XP and Windows 7 installations correctly and booting into them. I have checked out the locations of the files and also read a couple of forums regarding the same. The thing is the crappy part here is people forget that Windows 7 changes the damn Partition Letter to C: when it boots up which confuses the hell out of people when trying to do the recovering. So from this both Windows XP will show up as C: when booted from it and Windows 7 will show up as C: when booted up from it. Thus the confusion lies in directing the boot part to the appropriate disk partition and also following the instructions and entering the commands to the correct partition (XP/7)!
Please help me to recover the same or guide me as to what is to be done to recover or rewrite the boot partition or boot manager to load the OS' correctly. On unchecking hide files and system files I see that there are two boot.ini files(is this normal?) one each in C: WINDOWS 7 and D: Windows XP PRO. The files in C: Windows 7 are autoexec.bat, boot.ini. bootmgr, bootsect.exe, and config.sys. The files in D: Windows XP Pro are AUTOEXEC.BAT, boot, boot.ini, boot.LOG, CONFIG.SYS, IO.SYS, MSDOS.SYS, NTDETECT.COM, and ntldr. Where I originally installed was C: partition as Windows XP Pro and D: as Windows 7 but since now only able to boot into Windows 7 (Recovered) showing up as C: Windows 7. Am unable to figure out how to get things back to normal as too much of hard work went into installing it and never ONCE did it screw up until the FATAL error of trying to install XP onto the drive to use on the other system so a humble warning to my brethren.
boot.ini on C: WINDOWS 7 is as follows:
[boot loader]
redirect=usebiossettings
redirectbaudrate=
timeout=20
default=
[operating systems]
boot.ini on D: Windows XP PRO is as follows:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Windows 7 Ultimate" /fastdetect
Any help would be grateful. Both OS' are on a single 160GB hard disk with two partitions. There are two other drives on the system too. One 500 GB drive which contains the installation files of Steam and other games as there was less space so everything is spread around all over the place, and screwing up anywhere means I Lose Everything! Another new 2TB drive for data storage. The most Painful thought is risking losing all that time and effort and having to do a fresh install which will literally Kill Me! Your kind help would be greatly appreciated.

When I tried to reboot after removing the failed setup, I guess it was still going back to the Setup part and trying to find the other hard disk and not recognizing the boot sector of my own hard disk that contained the dual boot OS' and failed to start up. Turns out the problem for the files not copied error was a faulty RAM on the other system(YES RAM) of all things no connection at all between files not getting copied from the CD whereas it went through on one try from my system! 😱
So I succeeded in changing the Ram and getting that system installed. The problem is on my computer I tried repairing my installations to boot up and all I managed to get was despite failing Startup Recovery several Tries was a Recovered start of Windows 7 whereas there was no way in getting XP to boot. Whatever I try, it either goes to an NTLDR 0x00### whatever error and that's about it. Repair install does not happen as it only gives the option to install fresh in XP. I tried the FIXMBR, FIXBOOT, through Windows Recovery all in vain and even tried the Hirens and UBCD4WIN which didn't seem to help much. Guess you have to know which program to use and how and any wrong move can mean death to the PC.
What I want to know is if there is any way of rewriting the MBR or boot.ini/bootmgr/bootsector to recognize the Windows XP and Windows 7 installations correctly and booting into them. I have checked out the locations of the files and also read a couple of forums regarding the same. The thing is the crappy part here is people forget that Windows 7 changes the damn Partition Letter to C: when it boots up which confuses the hell out of people when trying to do the recovering. So from this both Windows XP will show up as C: when booted from it and Windows 7 will show up as C: when booted up from it. Thus the confusion lies in directing the boot part to the appropriate disk partition and also following the instructions and entering the commands to the correct partition (XP/7)!
Please help me to recover the same or guide me as to what is to be done to recover or rewrite the boot partition or boot manager to load the OS' correctly. On unchecking hide files and system files I see that there are two boot.ini files(is this normal?) one each in C: WINDOWS 7 and D: Windows XP PRO. The files in C: Windows 7 are autoexec.bat, boot.ini. bootmgr, bootsect.exe, and config.sys. The files in D: Windows XP Pro are AUTOEXEC.BAT, boot, boot.ini, boot.LOG, CONFIG.SYS, IO.SYS, MSDOS.SYS, NTDETECT.COM, and ntldr. Where I originally installed was C: partition as Windows XP Pro and D: as Windows 7 but since now only able to boot into Windows 7 (Recovered) showing up as C: Windows 7. Am unable to figure out how to get things back to normal as too much of hard work went into installing it and never ONCE did it screw up until the FATAL error of trying to install XP onto the drive to use on the other system so a humble warning to my brethren.

boot.ini on C: WINDOWS 7 is as follows:
[boot loader]
redirect=usebiossettings
redirectbaudrate=
timeout=20
default=
[operating systems]
boot.ini on D: Windows XP PRO is as follows:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Windows 7 Ultimate" /fastdetect
Any help would be grateful. Both OS' are on a single 160GB hard disk with two partitions. There are two other drives on the system too. One 500 GB drive which contains the installation files of Steam and other games as there was less space so everything is spread around all over the place, and screwing up anywhere means I Lose Everything! Another new 2TB drive for data storage. The most Painful thought is risking losing all that time and effort and having to do a fresh install which will literally Kill Me! Your kind help would be greatly appreciated.