ntoskrnl.exe blue screen

svchost.exe is a system process, certainly not the cause of your problem.

How long did you run memtest? Make sure to run it for at least 5 passes.
I ran it over night, I think I stopped it after 8 hours
 

My Computer

OS
Windows 7 Ultimate 64-bit
CPU
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (4 CPUs), ~2
Motherboard
ASUS SKT-775 P5QC S/L 1600FSB + Intel P45 + ICH10R Crossfire
Memory
4096MB RAM
Graphics Card(s)
ATI Radeon HD 4870 Sapphire 512MB
Monitor(s) Displays
SyncMaster T220
Screen Resolution
1680x1050
Hard Drives
500 GB Maxtor DiamondMax 23
PSU
Powercool 750W
Case
Black Thermaltake Soprano w/ Side Window
Internet Speed
50 mbit (6.25 megabyte/second)
It's doing random reboots also, I just had one even though I turned off restart at system failure
 

My Computer

OS
Windows 7 Ultimate 64-bit
CPU
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (4 CPUs), ~2
Motherboard
ASUS SKT-775 P5QC S/L 1600FSB + Intel P45 + ICH10R Crossfire
Memory
4096MB RAM
Graphics Card(s)
ATI Radeon HD 4870 Sapphire 512MB
Monitor(s) Displays
SyncMaster T220
Screen Resolution
1680x1050
Hard Drives
500 GB Maxtor DiamondMax 23
PSU
Powercool 750W
Case
Black Thermaltake Soprano w/ Side Window
Internet Speed
50 mbit (6.25 megabyte/second)
Try running in Safe Mode with Networking for a while. If it crashes, we know it's hardware.

Try this free stress test: Free Software - GIMPS
Prime95 Setup:
- extract the contents of the zip file to a location of your choice
- double click on the executable file
- select "Just stress testing"
- select the "Blend" test. If you've already run MemTest overnight you may want to run the "Small FFTs" test instead.
- "Number of torture test threads to run" should equal the number of CPU's times 2 (if you're using hyperthreading).
The easiest way to figure this out is to go to Task Manager...Performance tab - and see the number of boxes under CPU Usage History
Then run the test for 6 to 24 hours - or until you get errors (whichever comes first).
The Test selection box and the stress.txt file describes what components that the program stresses.
 

My Computer

Computer Manufacturer/Model Number
Custom
OS
Windows 7 Professional x64
CPU
Intel i7 2600K OC'd @ 4620 MHz
Motherboard
Asus P8Z68-V Pro
Memory
16GB GSkill Sniper 2133 Mhz (4x4GB)
Graphics Card(s)
EVGA GeForce GTX 480 SuperClocked+
Sound Card
Realtek High Definition Audio
Monitor(s) Displays
2x Acer S273HLbmii 27"
Screen Resolution
2 x 1920x1080
Hard Drives
64GB Crucial M4 SSD

Storage: Hitachi 1TB 5400RPM, Samsung 1.5TB 5400RPM
PSU
Corsair HW Series 750w (modular)
Case
Cooler Master HAF 932 Advanced Blue Edition
Cooling
CM Hyper 212+ CPU cooler, 3x 230mm + 1x 140mm case fans
Keyboard
Logitech MK320 (wireless)
Mouse
Logitech MK320 (wireless)
Internet Speed
30 Mb/s : 2 Mb/s
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