All my games stutter Windows 7/8.1 - I think I've tried everything

Hey,
For the past few months all games on my Windows 7 stutter ,offline and online games.It's a micro stutter,sometimes it last for couple of seconds followed by choppy sound.I founded out that when I use my front panel for my headphones when situation in games get really intensive (like heavy firing and loud sounds) make my sound stop (no sound) until I unplug it from front panel and plug it back again (that's with drivers that came with Windows 7.Also lowering the quality of in-game graphics (of any game) would give me more fps but game would stutter more (that made me suspect that temps are maybe causing the stuttering).Recently I was checking my DPC latency and it variated from 15-100 and upon starting Latencymon it would spike up to 16k.

List of things I've tried:

Cleaned my system/removed the dust.
Changed thermal paste on my CPU and GPU
Checked all hardware for errors: stressed CPU and GPU, checked RAM for errors = no errors
Checked HDD for bad sectors = 0 bad sectors
Fresh install of Windows 7
Fresh install of Windows 8.1
Tweaking BIOS settings
Updating all of my drivers
Tried different GPU drivers and sound drivers
Playing games from another hard drive
Defragmenting
Disabling all effects and stuff in Windows 7
Disabling devices in Device manager to see if DPC latency would lower (and upon disabling some device latency would spike up)
I've un-parked my CPU cores
Overclocked my CPU from 3,0 GHz to 3,6 GHz and clocked it back to stock 3,0GHz
I tried playing games with disabled audio drivers but it didn't work
Messing with in-game settings (with every game) - I would gain more fps but game would stutter more ; capping fps (to 64 fps) with nVidia inspector helped with CS:GO as it lowered stuttering
Googling - Yes! Every single day in past seven months (or more) I was trying to solve this problem and I failed.


Today I installed Windows XP x86 and launched World of Tanks and my FPS variated from 60 to 100 and on Windows 7 was like from 15-60 and the game was not stuttering at all (latest nVidia drivers and sound drivers were installed also).
Can someone help me out with this?What's the problem with Windows 7/8.1 on my machine.I suspect it be drivers.

My potato rig:
MSi 880GM-E41
AMD Athlon II x2 250 3,6GHz (Overclocked)
6 GB RAM
9600 GT
CoolerMaster Elite power 460W

Also I am not using Wireless card.I am directly hooked up with router.

~Аlso thank you all for your time and for reading this.

Maybe it is time to downclock the CPU to it's normal frequency and check if it is fixed

RoasterMen said:

Maybe it is time to downclock the CPU to it's normal frequency and check if it is fixed

Sadly it doesn't help.
PS. AMD Cool 'n quiet is disabled also.

I went back to Windows XP - The only solution that works so far.

Anak said:

I was going to suggest trying to control audiodg.exe by changing settings in control panel\sounds, you mention:

Disabling all effects and stuff in Windows 7 and I tried playing games with disabled audio drivers but it didn't work

But you didn't elaborate so I'm going to suggest you look at this site: How to solve audiodg.exe high CPU usage | DXSdata

There are some things you tried and some you haven't, and, there are two hotfixes that may offer relief, make sure you create system restore points before you try the hotfixes.

In its original state audiodg.exe has problems with high CPU usage and memory leaks in turn this can cause problems with your video so, the hotfixes may help.
You can search for them in control panel\windows updates\installed updates in case you want to see if they are already there, just paste the hotfixes KB numbers into the search box in the upper right corner of the installed updates window.

They are: 2670667 and 981013

Thanks for this information.I will try this as soon as I get Windows 7 to work on my second hard drive.

Volts :

Looks pretty fine to me.

Calculator gave me this results :
Load Wattage: 240 W
Recommended UPS rating: 500 VA
Recommended PSU Wattage: 290 W

Specs are updated.