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Please in future post on the appropriate section of the forum. In your case that should have been "Operating Systems-->Windows Vista.
This section is for hardware and components only.
The error can be caused by some third-party software firewalls (particularly Kerio), you can check this by uninstalling it if you have one.
Another common cause is malware infection. By far the best utility for exposing these is "HijackThis", though analysing the HJT log and knowing what to fix is a job for trained eyes & brain. That's because HJT lists everything that's running, both good and bad.
Go to this section: http://www.geekstogo...-Log-t2852.html
Read the "pinned" posts. You'll see links to various malware removal tools, including HijackThis. If you use HijackThis please post it's logfile to that forum only.