It's not a compatibility issue that I'm dealing with, it's the fact that my lag has increased since the installation of a game. Maybe I should uninstall it? 
can you paste system properties?
Operating System:
Microsoft Windows 7 Professional ()
* Version: 6.1.7600
* Build Number: 7600
* Install Date: 12/09/2010
* Install Directory: C:\Windows
* Locale: English (en) - United States (US)
* DirectX version: DirectX 11
Motherboard:
* Manufacturer: MSI
* Model: MS-6702E (v1.0)
Bios:
* Manufacturer: American Megatrends Inc.
* Model: Version 07.00T
* Release Date: 02/04/2001
Processor:
AMD Athlon(tm) 64 Processor 3000+ (AuthenticAMD)
* Max clock speed: 1.80 GHz
* Socket: Socket-939
* Version: Model 15, Stepping 0
Memory:
* Total Current Physical Memory: 1.50 GB
* Total Current Virtual Memory: 3.00 GB
* Maximum Memory Capacity: 2.00 GB
* Memory Devices:
1. Type: SDRAM - Speed: MHz - Capacity: 1.00 GB
2. Type: SDRAM - Speed: MHz - Capacity: 0.50 GB
Video:
NVIDIA GeForce 6600 GT
* Resolution: 1024 x 768
* Colour Depth: 32 Bits
* Refresh Rate: 60 Hz
Disk Drives:
Maxtor 4D080H4 ATA Device
* Size: 76.33 GB
* Number of Partitions: 2
WDC WD3200JB-00KFA0 ATA Device
* Size: 298.09 GB
* Number of Partitions: 1
Shouldn't be anything wrong with the hardware...