CheckSum Guard is a versatile and effective antivirus program for Windows 95/98/NT/2000. It can protect your executable files against almost all EXE & COM viruses. During the first run the program scans your drives and saves information about every executable file in its database. After that, each time you check your computer it adds information about new executables and checks old ones. If any of them has been changed since the last check, you will receive a warning and will be able to cure that file. The curing algorithm allows to fix more than 90% of infected files. The program's help contains an instruction that helps you to find the file that was already infected when it was copied on your computer.