Audio problems

I don't have a high end gaming computer or anything,My Graphics card is probably about 5 or more years old,but It used to run fine till yesterday,I was playing oblivion and My Graphics card overheated and the screen turned black so I turned my computer off,about and hour later I turned it back on and went to watch videos on youtube,and the sound was lagging. The video was fine but the sound was choppy and staticy,at about half speed as it should be. What can I do? (Notice this is just online,Windows media is running fine)

Windows Vista Home Premium Service Pack 2 (32-bit)
HP G60 Notebook PC
AMD Turion Dual-Core RM-70 2.00 GHz
3.00GB Ram
NVIDIA Geforce 8200M

Edit:I just restarted my laptop and It seems it's sound is much more laggy and video is now slow too
 
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