Software or Hardware problem?

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This is my notebook spec

Intel(R) Core (TM) 2 solo CPU U 3500 @1.4 GHz 1.4CHz
Ram 3GB
32Bit
Geforce G 105M Cuda 512MB
Vista
Directx 11

Well its only 3month since i brought this notebook and it was all working fine until
2weeks ago when i try to install need for speed: shift
and it some how change my directx....
then i try to play the game but i was too laggy so i uninstalled it

but now i can't even watch a movie with out the short pause in sound and graphic
i can't even play the counter strike condition zero and warcraft 3 with out lagging?

i won't is this got to do with my hardware or software?
anyway of fixing it?

BTW before i had installed Prototype and it change my directx to 9.0c (it was 10 when i brought it) and it was working fine.
but when i install NFS shift it changed to DX 10

and now i update my computer it was DX 11 and the short pause got more frequenly

anyone got this problem?
 
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