Computer lagging due to sound

[R_SooNami]

i have been recently experiencing unusual fps lag in counter-strike and stuttering in youtube. This problem is kinda hard to explain so bare with me. Before my csgo ran at 55+ fps high - vHigh settings with aa, now it is unplayable dipping down to 20s, i've tried lowering settings but makes little difference. Lag is worst when people are firing at me. I have also experienced lag while watching youtube videos, the video stutters, produces static noises (crackles) and distorts audio when i move my mouse and using scroll wheel. I can replicate this lag alsmost everytime if i scrolling up and down when in Steam. I have also noticed Cpu usage spiking when i scroll in steam. Weird thing is when im playing league i do not experience this fps lag except at the end of a game where the nexus explodes my fps during the nexus explosion has decreased from usual, i think it has something to do with the loud noises.

 

Things i've tried:

Turning off and on. lol.  

Updating drivers with driver booster 3. 

Scanning for viruses using Panda, malwarebytes and windows defender.

replugging  peripherals

using different peripherals

lowering game volume makes a very slight difference but sound is important in csgo. 

 

temperatures are normal

everything stock

 

specs:

intel q6700 2.66 ghz / 40c idle/ 60c while in csgo

mb asus P5KPL-CM

4gb ram ddr2

gigabyte gtx 650 2gb factory overclocked/ 36c idle/ 55c in csgo

NO SOUND CARD

VIA HD audio

HDD old and nearly full

Windows 7 prof 64bit

 

Does anyone have ideas to fix this? 

My last resort is to upgrade to windows 10.

[stealth80]

Try disabling your sound device in system devices and try again in game and see if the problem goes away (yes silent lol)

[R_SooNami]

i disabled then enabled via hd audio and the problem is still occuring.