VGA issue - very low performance

[ultimavn]

Last week my pc just decided to stop working so I brought it to the repair center. I try playing some games after I got it back and the result is abysmal. FPS was like single digit on everything so I decide to try using passmark and here's the test result

PassMark(TM) PerformanceTest 7.0 Evaluation Version (http://www.passmark.com)
Results generated on: Saturday, July 16, 2011


Benchmark Results

Test Name: This Computer
CPU - Integer Math: 826.1
CPU - Floating Point Math: 1267.1
CPU - Find Prime Numbers: 618.4
CPU - SSE: 5.1
CPU - Compression: 2878.0
CPU - Encryption: 8.2
CPU - Physics: 159.3
CPU - String Sorting: 1665.6
Graphics 2D - Solid Vectors: 0.6
Graphics 2D - Transparent Vectors: 0.6
Graphics 2D - Complex Vectors: 96.9
Graphics 2D - Fonts and Text: 56.4
Graphics 2D - Windows Interface: 40.1
Graphics 2D - Image Filters: 130.0
Graphics 2D - Image Rendering: 326.7
Graphics 3D - Simple: 67.9
Graphics 3D - Medium: 28.6
Graphics 3D - Complex: 7.2
Graphics 3D - DirectX 10: 0.7
Memory - Allocate Small Block: 3465.6
Memory - Read Cached: 2349.6
Memory - Read Uncached: 2131.0
Memory - Write: 1691.5
Memory - Large RAM: 1749.5
Disk - Sequential Read: 64.8
Disk - Sequential Write: 58.6
Disk - Random Seek + RW: 3.1
CPU Mark: 2357.6
2D Graphics Mark: 170.9
Memory Mark: 1034.0
Disk Mark: 457.2
3D Graphics Mark: 66.4
PassMark Rating: 547.1

System information: This Computer
CPU Manufacturer: GenuineIntel
Number of CPU: 1
Cores per CPU: 2
CPU Type: Intel Core2 Duo E8200 @ 2.66GHz
CPU Speed: 2667.1 MHz
Cache size: 6144KB
O/S: Windows 7 (64-bit)
Total RAM: 4094.5 MB.
Available RAM: 2805.6 MB.
Video settings: 1280x1024x32
Video driver:
DESCRIPTION: NVIDIA GeForce 9800 GT
MANUFACTURER: NVIDIA
BIOS: Version 62.92.23.0.10
DATE: 5-20-2011
Drive Letter: C
Total Disk Space: 49.0 GBytes
Cluster Size: 4.0 KBytes
File system: NTFS

I'm using 7.0 build 1022 64-bit.
Anything looks okay, except for the 2D and 3D Graphic Mark. While the 2D Mark is equal to 1/2 of other of the same model, which is somewhat acceptable, The 3D Mark is like 1/10 to 1/30. I suspect my VGA got swap but I wanna be sure before taking measures so here I am posting question.
Sadly I don't know much about hardware so would someone kindly explain in full details for me on this matter?

Thanks in advance.

[David (PassMark)]

Check the right video card device driver is installed.

See also this post,
Causes and Solutions for a slow PC

[ultimavn]

all 3 acceleration were checked from the start and I already try 3 different driver , very small different