Skype does not scan your system or Skype itself for viruses. This simple statement will help you deal with messages you receive on Skype similar to the following:
[Time] System Monitor ® says: WINDOWS REQUIRES IMMEDIATE ATTENTION
ATTENTION ! Security Center has detected
malware on your computer !
Microsoft Windows NT Workstation
Microsoft Windows NT Server 4.0
Microsoft Windows 2000
Microsoft Windows XP
Microsoft Windows Win98
Microsoft Windows Server 2003
Impact of Vulnerability: Remote Code Execution / Virus Infection /
Recommendation: Users running vulnerable version should install a repair
Your system IS affected, download the patch from the address below !
Failure to do so may result in severe computer malfunction.
Just ignore it. Or better yet, prevent these messages from reaching you (or someone who just doesn't seem to get it).
This is how:
1. In Skype, go to Tools > Options.
2. Click on "Privacy"
3. Select "Only allow people in my Contact list to contact me.
There. No more anonymous people sending messages about viruses that aren't on your computer.