PC more crashes than peak hour on the freeway.

That PSU sounds like the culprit. Apart that COOLPOWER is not a good brand, a good 850W PSU should cost around 100 bucks while that is sold at 50.

Also, you don't need 850W. your rig needs at most 450W, as this calculator says.

I am sorry AaLF, but I have to agree: the PSU you have is very likely the culrpit. The specific unit you have is a very low-quality unit and the kind of power that it delivers is very dirty, noisy, and unstable. A PSU like this one can easily cause worse problems than this and they usually do as time goes on.
 

My Computer My Computer

Computer type
PC/Desktop
Those specs have changed. Just updated specs page. This is good news if its the PSU. I've been terrified its the CPU.
 

My Computer My Computer

At a glance

Microsoft Windows 7 HomePremium 64-bit 7601 M...Intel(R) Core(TM)2 Duo CPU E4500 @ 2.20GHz8GbNVIDIA GeForce GT 710
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Generic - custom build
OS
Microsoft Windows 7 HomePremium 64-bit 7601 Multiprocessor Free Service Pack 1
CPU
Intel(R) Core(TM)2 Duo CPU E4500 @ 2.20GHz
Motherboard
Gigabyte Technology Co., Ltd. EP35-DS3P
Memory
8Gb
Graphics Card(s)
NVIDIA GeForce GT 710
Sound Card
(1) USB Audio Device (2) USB Audio Device (3) NVIDIA Hig
Monitor(s) Displays
older 21" thinkvision brand?
Screen Resolution
1680 x 1050
Hard Drives
WDC WD5000AAKS-22A7B0 ATA Device
ST3500418AS ATA Device
ST3320813AS ATA Device
PSU
ANTEC NEO ECO 520W
Case
generic tower
Cooling
couple of 4" fans
Keyboard
logitech k220
Mouse
logitech 305
Antivirus
malwarebytes premium
Browser
FireFox + opera
i ran the calculator with the specs you posted in the first post. And yes, even by eyeballing I can say that you won't really need more than 450. My rig is slightly better than yours and I do fine with a (trashy) 450W PSU.
 

My Computer My Computer

At a glance

Win 7 Pro 64-bit 7601AMD Phenom 9650 QuadCore, revision DR-B35 GB yes I run 2x 2GB and 1x 1GB, different b...NVIDIA GeForce 9800 GT 512 Mb, unknown manufa...
Computer type
PC/Desktop
Computer Manufacturer/Model Number
custom built
OS
Win 7 Pro 64-bit 7601
CPU
AMD Phenom 9650 QuadCore, revision DR-B3
Motherboard
ASUS M4A78
Memory
5 GB yes I run 2x 2GB and 1x 1GB, different brand, spank me.
Graphics Card(s)
NVIDIA GeForce 9800 GT 512 Mb, unknown manufacturer.
Sound Card
Crappy Realtek Integrated Audio
Monitor(s) Displays
Fujitsu Siemens P19-3P
Screen Resolution
1280 x 1024 x 32 bits @ 60 Hz Oh yeah, 4:3 rocks!
Hard Drives
(1) MAXTOR S TM3320613AS SATA Disk Device (2) STM35004 18AS SATA Disk Device (3) TOSHIBA USB 2.5"-HDD
PSU
whatever, around 450w
Case
Scavenged from old company PC, 10+ years old
Cooling
CPU fan, GPU fan, case fan, nothing fancy
Keyboard
Microsoft, PS/2, white.
Mouse
Optical, logitec.
Internet Speed
effective max speeds: 70-ish kB/s down 30-ish kB/s up
Antivirus
Avira, free edition.
Browser
Firefox with FXChrome to make it look like Google Chrome :P
Other Info
Was discarded by previous owner due to "horrible performance".
Was running Win Xp from a IDE drive. Yeah. Was a pain.
SATA II drive and Win7 and it zips away! Yay!
Those specs have changed. Just updated specs page. This is good news if its the PSU. I've been terrified its the CPU.

If you don't replace the PSU now, then you could end up with problems with other components.
 

My Computer My Computer

Computer type
PC/Desktop
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