My money would be on NIS 2010 as the culprit. Any Internet Security app with a 3rd party firewall will interefere with system services in Windows 7 & Vista. Windows Explorer & Internet Explorer (or default browser) most times with ntdll.dll will be involved. It is an APPHANG followed by an APPCRASH after 30000ms. Then possibly a BSOD.
- fading white background
- never-ending spinning blue circle
- "..Not Responding.." top-right of the screen
Regards. . .