Win 32 sality.nau antivirus clean it?

If you go to Symantec's website, search for "Win 32 sality.nau Fix" and you should be able to download a program which will simply remove the virus, instead of the file it has infected. Norton antivirus should do the same, although it is expensive. It all depends on how easy the .exe files are to replace. If they are easily replacable then I would suggest simply deleting the files and replacing them later, although it sounds to me like you could do with investing in Norton 360 anyway, which will catch and quarantine/delete and infected file as soon as it makes its way on to your computer.