What are the most common signs that indicate you have a
The most common signs are:
Slow response to all programs.
Keystrokes taking a long time to appear on the screen.
Excessive network traffic, usually from the infected computer scanning for
other vulnerable hosts on the network.
Sudden data loss and file corruption.
And the worst of all the inability to boot your computer.
Always use an up-to-date antivirus software. Keep your PC up-to-date on all
of the hotfixes/patches.
And if an email looks suspicious do not open it delete it.
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Update: June 2012