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It is not your computer...SP2 among many other microsoft updates are not playing well with others even directX 9 are having issues with old drivers. Your system came preloaded with windows and all of it's system drivers which work great when new, but updated system files may have issues which if you go to the sony site, look up the drivers, bios, and utility updates it should have updated versions that fix many of the issues you are having. Laptops use third party utilities to control volume, keyboard and monitor functions so it is just as important to update those as well.
If you go back to the way your system was when it was new you will need to erase your hard drive with fdisk or some other utility becaue sp2 makes changes to the partition structure that does not work well with a xp, xpsp1 reinstall.
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