have you been fiddling in your bios again?
if so, the root of your woes is probably here.
if not... your motherboard is fried... sorry dude, but there are NO other available options. Windows will always give you the F8 screen.
sooo....
The keyboard and mouse are working.
Windows is working - it loads but no control yes?
Either you've tweaked something in the bios (can you get into it?), or if you haven't(and no-one else has) then the sockets are fried on the back of your pc.
The other thing worth checking - and i know it sounds lame, but this eluded me for two days a while back - is make sure everything is plugged in properly.
If all else fails - i.e. you HAVE changed your bios, but cannot get back into it, there should be a bios reset jumper on your motherboard. This is the final step. Only attempt if all else fails.
Good luck. :sob:
PS - before you buy a new motherboard, i'd invest in a new mouse and keyboard. Might save yourself a bit of cash, and you deserve it anyways to get the horrible experience out of your mind