System lock up after installing PD 6.10

[Grant]

I recently installed PD 6.10.

Starting then, every day or two, I get a complete system lock up with a blank screen with only a "equal sign" shaped cursor in the upper left corner of the screen. this usually occurs after I have not used the system for over an hour and MS power management has activited.

I have turned off Norten utilities and virus checker and also the system scheduler and the problem still happens.

I even stopped playing MS flight Sim 2000 to see if that helped, it did not.

I mostly use just plain vanilla applications like office 2000, adobe photoshop and explorer 5.0

(During installation of the drivers I received a system stack overflow message and it went away. Matrox tech support told me not to worry about it.)

I would appreciate any suggestions on how to troubleshoot this problem.

thanks

Grant



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Dell Intel 440bx, P2 450, 128 megs ram, IBM 13g hard drive, G400 Max, PD 6.10, 256k AGP aperture, Win 98 SE, DirectX 7.0 (not a),TBS Montego Audio, Dell D1226H 19 inch monitor at 1280x1024x32, 3com XL10/100