Obviously you have access to another computer, or your post wouldn't be here ! I can think of two things short of a complete rebuild that may help you.
1 If you have data on this computer that you would really like to keep, the first thing to do is to try and salvage it. Download a copy of Puppy Linux from here :
This is perfectly safe - I have used it myself - and it will run from a USB drive. It will boot your computer and then you will be able to see your hard drive(s) so that you can save valuable data - work, photos, music, etc. - to an external hard drive. The Puppy web-site is full of useful advice as well.
2 Then you need a Windows repair disc for your version of Windows - 32 or 64 bit - the instructions on how to make one are here on BC, along with advice on how to use one. Again you can run it from a USB.
Once you have salvaged any data you want to as in (1) above, turn the computer off. Connect the Windows repair USB and re-boot the computer. If it doesn't start to boot from the USB, shut the computer down and re-start it. This time go in to the BIOS (normally - not always - press the 'Delete' key while the BIOS screen is showing) and change the boot priority order so that USB is first. You can always change it back later.
Save the changes and exit the BIOS. The computer will re-boot itself and this time should boot from the USB stick. Follow the instructions on screen, and with any luck you should be back to having a working computer again.
IMPORTANT NOTE. It is possible your computer is still infected, unhappily not all 'someones' are equally competent. If the above does not improve your condition towards a working computer, I suggest you post back here in the 'Am I infected ...' section of BC. These people are busy and may take a day or two to get back to you but they do know what they are talking about ! Follow their advice and ask if you don't understand something.