My sound dosn't work rite. Why? It did before!

When I play Cross Fire my sounds doesn't work right. I uninstalled and reinstalled it 4 times so far and it still doesn't work! I play with headphones, laptop speakers, and regular speakers and the sound still is all "rattly"! Please tell me how to fix this problem! The sound has worked before also!

This is my system:
Manufacturer: TOSHIBA

Model: Satellite L455D (I use a DSL connection through a Belkin cable)

Rating: 3.1 Windows Experience Index

Processor: AMD Sempron(tm)
SI-42 2.10GHz

Installed memory (RAM): 2.00 GB (1.75 GB usable)

System type: 32-bit Operating System

Pen and Touch: No Pen or Touch Input is available for this Display

Windows 7 Home Premium

This is all I could find for my system setup. Hope this helps! Please tell me how to fix this!
Oh and I'm using a laptop also.

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