The use of multiple antivirus programs may cause your system to lockup. Anti-virus programs come pre-installed on most computers.
Customers sometimes install other anti-virus programs without realizing that there is already a system installed. If you decide to install an alternate anti-virus software, it is important that you first uninstall any other anti-virus programs that may be running on your computer.
Choose only one anti-virus program and reinstall it. It is not recommended to have more than one anti-virus software package installed on your computer. Multiple anti-spyware packages that do not have an AV component do not conflict and can remain on the computer.
Alpha Computer Support recommends AVIRA antivirus