I hear cracking/distorting noise.

Greetings ,

I'll cut the long hard discription to the point to save your time from all the bullshit. Whenever i do dual programming , like for instance , listen to music player and browse and when the page loads , i hear some kind of cracking noise.

Similarly if i press the key "F5" which is refresh on the desktop and if i hold it and listen to music , there is high cracking of noise.

I checked everywhere in the net , some say its a windows problem , some say its a sound card problem. I dont understand what it is.

Oh and one more thing , it doesnt happen that much if i have just formatted my pc and there is NOTHING in it. Not even MoBo driver installed.

My pc spec [weak , gonna upgrade it soon]

Intel Core2duo @2.80ghz e7400
2 gb DDR2 RAM
1 TB HDD + 80 GB Complimentary
250w PSU
1gb DDR2 GPU : Geforce Nvidia 9400GT
OS : Windows 7 - Ultimate 32 bit

Please help me because everytime i try to play game and there is something running in background , like a torrent or something [Just the torrent , i make sure everything else is off. Sometimes even the Antivirus] , this frequent cracks come forth and completely annoys me off.

Thank you for your time Sirs / Mams.