Low level format problem with HDD and win XP

[RichardKt]

I have a Westerd Digital 160 GB Hard Drive Model WD1600BEVE that was working well on windows XP until today. I did a low level format then I initialized it as one big partition and then I made it active. I wanted a clean HD to install windows 7 on. After I did that windows 7 installation does not see the hard drive. Windows XP also no longer sees the drive. I can connect the drive on my my desktop and copy pictures and doccuments to it and it works fine that way. I feel the low level format deleted something in the boot sector that I need to reinstall but I am at a loss. Any ideas would be appreciated. Thanks in advance,
Chipmaster