MatsPunt's post is what you need for your phone. For your PC, boot from the Windows disc, and when you reach the "Install Now" button, press Shift+F10 to get a command prompt, and make sure you don't have any flash drive or USB HDD (or your phone) plugged in. Now put these commands in:
bootsect /nt60 SYS /force
And reboot. Hopefully, you're done. If not, well, nothing can go bad.
And the phone? We feel the same, buddy... we all feel the same. Well, other than the time I booted/rooted/backed up DRM/unlocked bootloader of my phone, but since that...