If you already havnt....
Make sure your cmos is correct for the HD you put in.
Dbl check master and slave jumper.
Try plugging the belt into other IDE.
Did linux find the HD..or is it lost @ cmos
If there is more than 1 HD already in the PC... make sure the boot sequince is set to the HD with the correct Master Boot Record for windowz.
If there is more than one HD.. the MBR might be on a diffrent HD than the one the OS is on..
I feel your pain...been there done that..have the dented PC case to prove it