Posted 02 November 2010 - 02:26 PM
Reboot into Safe Mode and see if the same behavior happens there. I recommend F8 over msconfig to get into Safe Mode in your case, since explorer crashes every few seconds may get in your way. Reboot, and start spamming F8. You'll see a menu appear - choose Safe Mode.
While in Safe Mode, press Ctrl + Alt + Del and in the task manager, click on the file menu and choose "New Task (Run...)". Type eventvwr.msc and press enter.
In the left hand side of the Event Viewer window under "Windows Logs", open the "Application" log. If these crashes are happening every few seconds then related events shouldn't be too hard to find. Also check the "System" log to see if you can find any additional information. These logs may reveal more about what's causing these explorer issues.
Additionally, please provide more information about your computer (make, model, etc).
Windows 7 Pro x64
WD Corsair Black 500GB | Samsung Spinpoint F3 1TB
G-Skill 2x2GB 1066 DDR3 SDRAM
NVIDIA GeForce GT 240