I am back again with recurrence of the same problem on the same computer. My orignial fix for the problem with Windows XP was to turn off hardware acceleration. The freezing up completely disappeared after that & the computer ran well - probably better than it ever ran. The video on youtube was still choppy though, but other video played reasonably well.
This time, though, I have installed a new 1 tb HDD which I partitioned to two (nominally) 500 gb "drives". I have a fresh, successfully installed Windows 7 Home Premium Edition on one partition. The whole computer is prone again to randomly "freezing". The usual scenario is while moving a displayed object with the mouse pointer or simply moving the lines up or down on, say, task manager or in MS Config.
At first, it seemed co-incidental with extremely high RAM & CPU usage (like 70% & up and 100% respectively). I disabled automatic updates which "cured" the high RAM & CPU usage. It continued to freeze though. I thought that I would simply disable hardware acceleration again but the access button for doing so is "greyed out". I tried several other drivers - a new one, the Windows 7 default driver and an older Vista driver with a number prefix of "178." This last driver seemed to work a bit better - as in it would allow slow movement of the cursor for a while before it froze. It is now my understanding that the hardware accelerartion cannot be disabled while using this card in Windows 7 (while, in XP, it is available). Does anyone else know this to be true as well? My usual test for the video is to try the various included card games - solitaire, spider solitaire, freecell etc and see how the resolution looks, how fast they deal out and how fast the game will put all the cards "up" once the last move is made. So far, I could get it to deal all the face down cards and at about the fifth face up card, it froze. It is not high tech and the cards really aren't super fast things but ....that is not positive, to say the least.
I ran memtest 86 again (for "only" about 2 hours - there are 2 - 1gb cards of ddr 240 pin ram. They're about a month or so old). The test run showed no errors.
Now, here is the part I do not understand. I can run this machine in safe mode with or without networking. It does NOT freeze at all - at least it hasn't yet. I am prevented from trying the card games though. I checked to see that the device manager shows the same driver is also being used in safe mode.
I actually sent my questions to their online support people but, sadly, never received a reply....anyway...I am a bit fed up with all of this and I am a bout ready to try a seriously downgraded gpu to see if I can make things work properly.
Does anyone have any other ideas?