Today I found that Nod32, Spybot and Zsoft Uninstaller have disappeared from my pc and I cannot install them back. The executables don't show up anymore in their folders and the icons pointing to them have become generic icons, but if I try to reinstall or copy the executables from a backup they won't be copied. For instance if I try to rename any file to uninstaller.exe (the name of the Zsoft executable) I get an error: "Impossible to write uninstaller.exe", anywhere I try to write it. I cannot have a file named uninstaller.exe or nod32.exe anywhere on my pc anymore! Please help me I'm desperate, I've never been beaten by a virus before.