Reformating laptop?

i enjoy a dell inspiron 9300 with an english text of xp home ed. my friend reformated my laptop and now i hold a chinese version of xp professional. i thought no big operation, i'll just use that instead. later i installed a few games but it doesnt run (either an error message popup or the screen go black and then returned to desktop). after that i also found out that my wireless internet isnt working, i cant display my nvida card, and my blind resloution is reduced with a lower color. any theory how i can fix this? do i need to reformat it again or do i necessitate to download some drivers?

p.s. i reformated my laptop in the first place is becuz my baby grand and mouse isn't working. i sent it to a store, they fixed it by exchanging some parts. when they tried to turn it on, it wont reboot. so they reformated it. dunno if this info is important.

Answer:
Better you reformat it again.

Check the laptop. Most of the laptop comes along next to pre-loaded OS. You can see the license key of the loaded OS somewhere down (a sticker would be there).

Use like peas in a pod OS and same key.

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