If you have a second pc please put a virus scanner on the second pc then remove the C drive with the infected files then place this on second pc please set the C drive to slave then cable it up then boot up second pc then run virus scanner program and wait for it hunt through the D dirve and this will get rid of the pesky virus's then use the second pc to do a scan disk to make sure it has not currupted any files.

then when all is clear then place the hard drive back into your main pc jupering it back to C or master then re-boot and all is well but if all is not place back into second pc and sdave your files out to second pc then redo windows this will be your only solution as you have had the hard disk effected you will need to re-format the disk please search on the web for this as you may need to print it out.

hope this works out for you