HTTPs Tidserv Request intrusions

For the fist time in 2 years I had a BSOD this week, twice on startup. Then NIS 2009 started reporting "HTTP Tidserv Request" intrusion attempts.  I'm guessing they are linked. Is it definately a rootkit and what harm could it be doing?

 

I am running Vista Home pro, sp2, and ran full system NIS scan etc, and nothing found.  I've trawled this board and googled a lot, and all references to fixes are very confusing, try this, then don't try this etc.

 

What's the latest advice on how to get rid of this? I'm at a loss as what to do next, Windows is installed on it's own partition, all data is stored on other partitions on my HD. So last resort could be a format of C drive reinstall of Vista which I really don't want to do unless absolutley necessary.

 

Any advice on how to remove this is much appreciated!

 

Many thanks, Ciaran