While
Symantec,
Norton,
Trend,
Panda &
McAfee
can provide excellent antivirus software programs.It is likely your computer or server is infected with a computer virus if:
Files are being deleted, corrupted or changed.
A RAID failure was observed.
A blank screen is observed or blinking cursor.
User enters one URL and is redirected to a different website.
A valid URL gives a message, "The page cannot be displayed."
User notices "missing operating system" warning.
If your virus program does not find a virus, yet your system responds very slowly we suggest looking deeper. In many cases, viruses can avoid detection by:
Changing their appearance and size.
Hide the changes it makes to the hard disk.
Modifies files by changing the pointer in the directory.