YOU guys are missing what the initial poster said, he has a VIRUS, he don't even know what kind, now if its a new kind of VIRUs hows is the antivirus going to work especialy in Nigeria eh, here in the developed world we don't use CD based antivvvirus we use networked ones ie, paid subscription to something like Mcafee, fru online,, but then again ours are on net 24/7 so get regular updates,
Now like the other guy said, if you have files you can't do without then take you HD toa technician to retrieve your files,
but in all, you cna only get rid of it by reformating and you got windows XP CD handy
now that don't always solve the case as we have what we call Boot Sector Virus, now that one resides in your motherboard, thats Death of a PC

because in other for any technician to repair it, virus might transfer themselvs from your system to thiers, hard work abi