Alienware M14x R1 Performance Down After Reinstall Windows 7

I have problem with my Dell Alienware M14x R1 WIndows 7 Home Premium 64bit (original windows from dell).

the problem is after reisntall windows 7 64bit and also install all driver (i downloaded from dell.com) i have problem with performance on my laptop its like down performance like before reisntall. and when i see on performance information and tool on windows 7 i just get score 4.1 (like on picture) because my 1st score is 7.9 and on windows information my nvidia not detected, but driver already installed and also on bios already detected.

if im using new nvidia driver from nvidia website score will be change with result 3.7 but if i change the driver and install the old driver from dell.com i mean the 1st version of the driver (like on picture) i just got 4.6 please help me to fix this problem and get my old score 7.9 and also setting my laptop to normal again. thanks.

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Alienware M14x R1 Performance Down After Reinstall Windows 7