When I turn my PC on (Dimension8500) a McAfee warning appears which reads,

 

'A Suspicious Script Has Been Detected. The file C:\WINDOWS\system32\ukryna\svshost.exe contains suspicious scriptong and has been stopped'.

 

When I choose the find more information option no subsequent message or information appears. When I continue using my PC it runs slowly and I can't access various websites.

 

Can anyone explain what this message means and, more importantly what I can do to remove the suspicious script and return to 'normal'?

 

Thanks in advance.