Windows Server in the Shared Menu in the Finder

I noticed something strange after the Installation of a Windows XP VM on my new Mac Pro: In the Finder sidebar comes up a little PC icon under the Shared-Menu. And it stays there even after quitting Windows XP and Parallels. Some minutes later it disappears suddenly. We do not have any PCs at home, only Macs and none were running. On the other 2 macs, a MacBook Pro and an iMac, all with Parallels and XP installed, I never notced this same behaviour. The PC-Icon in the sidebar has my Username followed by 3 numbers.

What is this and how can I get rid of this pesky little icon?

Everyting else is running smoothly and very good.

Thanks for your help.

 

Anyone figure this out yet?