Ok, i had the STOP error on my main computer, and i reinstalled windows, and it seems to have fixed the actual stop error; thanks for that

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However, although most of my files (music, movies applications ect...) remain intact, I have lost all of my personal settings, I can't get my internet connection (with sky broadband) up on the same computer again for some reason (I'm using the same internet for this computer I'm posting with, and its working perfectly fine). Some other programs have stopped working (like iTunes, it says i need quicktime for it to work, which I should have, but the reinstallation must have lost something somehow).
Also, when i scroll down and sideways, it seems to be going very slowly for some reason , and my 2 AND ' keys are mixed up with each other, though they are working just fine with this computer - What the...!?
Any advice on how to get my computer back to normal again (connect Sky, fix the scroll problem and get the keyboard error back to normal)? Thanks,
Randeep