how can i convert gtp hard drive to mbr without operating system??

[toufique]

my computer was in windows 8. i wanted to operate with windows 7. but while installing windows 7, when i formatted the partition and tried to install it, i showed partition is in GTP format. Now how can i convert GTP to MBR without installing windows again??

 

[RealBeast]

Probably the easiest way is to use the free standard version of AOMEI partition assistant and read THIS GUIDE on how to convert.

Do you really need to convert it though?

 

[johnbl]

if your partition is less than 2T in size I just boot on a windows image, delete the partition, and create a new one less than 2 terabytes in size and format it as a MBR.

deleting the partition will delete any data on the partition

I guess some of the newer systems have UEIF mode or legacy BIOS compatibility

look at this answer here:
http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_install/getting-gpt-partition-error-when-trying-to-install/42a3164b-066f-41f6-9d9d-7779d706835b