If you're downloading files from the Net, then you should be sure to protect yourself first with a good anti-virus utility. Viruses are small programs that can be contained in any type of executable file that you download. Their effects can range from mischievous pranks to serious damage of your computer.
Before you fork over $40 or so for a commercial product, check out one of the excellent free anti-virus utilities that we list below.
The programs we list here will either clean and/or scan your computer for viruses. And be sure that you check with the provider of the anti-virus program that you download for periodic updates, as new viruses are appearing all the time on the Web.