I've read that this problem often has to do with UPnP and/or plug and play related startup items, and tried the following, per directions on other sites:
1. Disabling both SSDP Discovery Service and Universal Plug and Play Device Host in "Computer Management" (right-clicking My Computer and going to "Manage").
2. Setting one of the above to "Automatic" and one to "Disabled," then vice versa.
3. Setting both to "Manual"
All Windows Updates (including Service Pack 3) have been installed successfully. Otherwise the system is pretty bare-bones right now, I haven't even gotten Office re-installed. The only things I've installed are my video, sound, and on-board ethernet drivers, Firefox, Thunderbird, iTunes, TweakUI, Java, Adobe Reader, Adboe Flash Player, VLC (video player) and AVG.
My next step was going to be to start un-installing things to see if I could find the culprit, but I figured someone here might have a more precise approach.
Edit: Also, in apparently unrelated news, I can't get the annoying "click" noise to stop every time I click a folder in windows explorer. When I disable it in "Sounds and Audio Devices" it turns itself back on next time I open Explorer.
Edited by keller, 04 August 2010 - 02:25 PM.