Well without seeing the error report data and without knowing your hardware -- it's though to say what's causing the issue.
I've heard reports of HP printers (the KB article posted) causing the issue. I've heard reports of spyware/malware/virii causing the issue. I've heard reports of a specific NAV update that causes the issue. Etc. Etc.
May want to check your system for spyware using additional tools. Run full virus scans using an addional AV program. If you have NAV you may want to try uninstalling it and rebooting you system before reinstalling it.
If you haven't run Windows Update in awhile I'd recommend that as well.
Next time you get the msgbox post the report data -- it'll make things much easier.
