How do I reinstall Windows 7?

[cksmith91]

My computer won't startup in normal or safe mode and I was told my windows 7 may be corrupt. I am trying to reinstall it, but I'm not sure how. I place the disc in the drive and rebooted the computer but it didn't work. The system repairs won't work, nor will system restore. I won't lose anything really important if I start over, I just can't figure out how. I've been looking online for help and can't find anything to work. Is there a command prompt or anything?

Desktop
Ibuypower WA 910i
64-bit

 

[Emerald]

check in the BIOS and make sure the boot order is CD/DVD before hard drive

 

[christop]

You can also put the dvd in and on boot up press f8.

 

[RetiredChief]

Select CUSTOM install.
On page that ask where to install, it should show you what partitions are available - Delete them All. Then select the unallocatted space to install to - You do not have to use the entire disk, you may specify the amount of space for the operating system and then use the remainder of the HDD as a "D" drive.