BSOD since 2 years !

Anti-Virus Removal:
Please do the following:
- download a free antivirus for testing purposes: Free AntiVirus
- uninstall the Kaspersky from your system (you can reinstall it, if so desired, when we're done troubleshooting)
- remove any remnants of Kaspersky using this free tool: Removal tool for Kaspersky Lab products
- IMMEDIATELY install and update the free antivirus
- check to see if this fixes the BSOD's

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DLKRTL.sys   Thu Dec 21 01:03:28 2006 (458A23B0)

H/W Diagnostics:
Please start by running these bootable hardware diagnostics:
Memory Diagnostics (read the details at the link)
HD Diagnostic (read the details at the link)

Also, please run one of these free, independent online malware scans to ensure that your current protection hasn't been compromised: Malware (read the details at the link)

Then, if the above tests pass, I'd try these free stress tests:

FurMark download site: FurMark: VGA Stress Test, Graphics Card and GPU Stability Test, OpenGL Benchmark and GPU Temperature | oZone3D.Net
FurMark Setup:
- If you have more than one GPU, select Multi-GPU during setup
- In the Run mode box, select "Stability Test" and "Log GPU Temperature"
Click "Go" to start the test
- Run the test until the GPU temperature maxes out - or until you start having problems (whichever comes first).
- Click "Quit" to exit

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Prime95 download site: 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. (run all 3 if you find a problem and note how long it takes to error out with each)
- "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).
This won't necessarily crash the system - but check the output in the test window for errors.
The Test selection box and the stress.txt file describes what components that the program stresses.

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Two other video stress tests (may be more stressful than FurMark):
Video Memory stress Test - МИРNVIDIA / Утилиты / VMT
Artifact Locator - МИРNVIDIA / Утилиты / Artifact Locator
Sorry, but I don't read the language that this website is made in.

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[font=lucida console]
Built by: 6002.18267.amd64fre.vistasp2_gdr.100608-0458
Debug session time: Mon Oct  4 00:04:11.898 2010 (UTC - 4:00)
System Uptime: 0 days 3:56:50.758
Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+bdd6 )
BUGCHECK_STR:  0x1a_403
DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT
PROCESS_NAME:  Blizzard Update
Bugcheck code 0000001A
Arguments 00000000`00000403 fffff680`00026b90 bbc00000`76312867 fffff680`00026bff
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Built by: 6002.18267.amd64fre.vistasp2_gdr.100608-0458
Debug session time: Sun Oct  3 17:23:18.716 2010 (UTC - 4:00)
System Uptime: 0 days 0:00:55.357
Probably caused by : ecache.sys ( ecache!EcBlockDereference+1b2 )
DEFAULT_BUCKET_ID:  COMMON_SYSTEM_FAULT
PROCESS_NAME:  System
BUGCHECK_STR:  0x7E
Bugcheck code 1000007E
Arguments ffffffff`c0000005 fffff800`02c8f7cd fffffa60`0296bfc8 fffffa60`0296b9a0
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
  
  [/font]