Hello,
Norton Internet Security 2011 found in Skype.exe (Portable) the virus WS.Trojan.H.
More about the virus: http://securityresponse.symantec.com/security_response/writeup.jsp?docid...
Please check Skype Portable if there is really an virus in it.
And please update this topic with the results.
Greeitns
OLLI