...your best option will be to reformat and reinstall everything back to it's factory condition using the system's recovery discs. Unfortunately, since you've not told us anything about your computer (operating system, make and model number, etc.), it's tough to give any suggestions that are more specific.
Hope this helps.
good day everybody! does anyone knows how to erase the virus, named do not erase.exe folder, list.exe,workbook1.exe and something like a dos icon shortcut in my startup folder, my system restore was disabled in services (in safe mode also). The task manager closed itself whenever i open it, i cant install a program cause it automatically closed. Please help!