For starters you need to update your forceware driver 43.51 is positively ancient. Another point is the MX is also a dated card and may only be able to run these games at lower resolutions/ settings.
Check in your bios to ensure onboard video is disabled (this should happen automatically when you insert the new video card but in some older systems it may not)
As to your other problems it sounds like a corrupt windows installation, if you can boot into windows put your XP disk in the rom drive, cancel auto run, go to start > run, type in sfc /scannow (note the space between sfc and the / ) this will replace corrupt windows system files, if you can not boot to windows normally boot to safe mode and run sfc /scannow or failing that run a repair install.
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Originally Posted by nusrat0915
The version is 4.3.5.1.
I forgot to tell you that I'm using this graphics card for 2 weeks only. Before that I was using built-in graphics card. This problem was still there when I was using the previous one......
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This last little gem of information makes me wonder if you are trying to run things at settings your hardware is not capable of supporting.