Windows Taskbar/Explorer Keeps Crashing

I've tried solutions given on other similar questions on this forum, but no solution.

Every now and then, the Windows 7 taskbar just freezes... I can't click on any of the taskbar icons, the windows clock freezes, if I hover over any of the taskbar icons they won't "glow", etc., and clicking multiple times rapidly on the taskbar eventually causes Explorer to crash and restart on its on. This problem occurs every 5 minutes or so, and I've tried the usual methods of fixing: antivirus scans, chkdsk, sfc and hijackthis. The problem remains.

Any suggestions?

Windows 7 Ultimate w/ SP1
64-bit Operating System
Intel Core 2 Duo CPU E4500 @ 2.20 GHz

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