Installing computer virus protection applications and knowing do-it-yourself procedures to remove PC virus problems are commendable things to do especially when working with a Windows computer. Computer viruses are quite common and they can cause a lot of problems. Lost documents, inaccessible disks, corrupted files, system freezing, and erratic computer operation are just some of the major hassles a PC virus infection brings forth. It is good knowing how to address them without seeking professional help though mistakes in the virus removal process can lead to more serious problems.