Ive installed nothing that I can think would effect gameplay..
As for my specs they are as follows:
(nothing special but I doubt its the worst, also have I mentioned ive never had this problem till recently)
System
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Manufacturer Hewlett-Packard
Model Compaq Presario CQ50 Notebook PC
Total amount of system memory 2.00 GB RAM
System type 32-bit operating system
Number of processor cores 2
64-bit capable Yes
Storage
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Total size of hard disk(s) 782 GB
Disk partition (C:) 83 GB Free (177 GB Total) - game installed to this
(Also have 600 GB portable harddrive)
Graphics
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Display adapter type NVIDIA GeForce 8200M G
Total available graphics memory 895 MB
Dedicated graphics memory 256 MB
Dedicated system memory 0 MB
Shared system memory 639 MB
Primary monitor resolution 1280x768
DirectX version DirectX 10