Please Help...PC restarts all of a sudden..

A new & strange problem...while working my pc has started to restart suddenly with a BLUE SCREEN ERROR..it usually happens when i'm working on lots of things..for instance i have firefox open..downloads on & then i click on my computer..the pc just restarts..so it basically happens when i switch to a different task...login happens as usual and i do not get any errors on disk checking..however when the system starts iget the error message-- the system has recovered from a serious error..with variable error messages..in technical information. here is the Hijack This log file--

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 7:25:42 PM, on 10/6/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
Boot mode: Normal

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\SOFTWARES\Kaspersky Lab\Kaspersky Anti-Virus 2009\avp.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\SOFTWARES\Kaspersky Lab\Kaspersky Anti-Virus 2009\avp.exe
C:\Program Files\SOFTWARES\Nokia\Nokia PC Suite 6\LaunchApplication.exe
C:\Program Files\DNA\btdna.exe
C:\Program Files\PC Connectivity Solution\ServiceLayer.exe
C:\Program Files\SOFTWARES\Nokia\Nokia PC Suite 6\OneTouchAccess.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Windows Media Player\wmplayer.exe
C:\Program Files\SOFTWARES\Trend Micro\HijackThis\HijackThis.exe

O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: ClickCatcher MSIE handler - {16664845-0E00-11D2-8059-000000000000} - C:\Program Files\Common Files\ReGet Shared\Catcher.dll
O2 - BHO: IEVkbdBHO Class - {59273AB4-E7D3-40F9-A1A8-6FA9CCA1862C} - C:\Program Files\SOFTWARES\Kaspersky Lab\Kaspersky Anti-Virus 2009\ievkbd.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\SOFTWARES\Java\bin\ssv.dll
O3 - Toolbar: ReGet Bar - {17939A30-18E2-471E-9D3A-56DD725F1215} - C:\Program Files\SOFTWARES\ReGet Software\ReGet Deluxe 5.2\IEBar.dll
O4 - HKLM\..\Run: [AVP] "C:\Program Files\SOFTWARES\Kaspersky Lab\Kaspersky Anti-Virus 2009\avp.exe"
O4 - HKLM\..\Run: [PCSuiteTrayApplication] C:\Program Files\SOFTWARES\Nokia\Nokia PC Suite 6\LaunchApplication.exe -startup
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKCU\..\Run: [BitTorrent DNA] "C:\Program Files\DNA\btdna.exe"
O4 - HKCU\..\Run: [SRS Audio Sandbox] "C:\Program Files\SOFTWARES\SRS Labs\Audio Sandbox\SRSSSC.exe" /hideme
O4 - HKCU\..\Run: [BitComet] "C:\Program Files\SOFTWARES\BitLord\BitLord.exe"
O4 - HKUS\S-1-5-18\..\Run: [Nokia.PCSync] C:\Program Files\SOFTWARES\Nokia\Nokia PC Suite 6\PcSync2.exe /NoDialog (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [Nokia.PCSync] C:\Program Files\SOFTWARES\Nokia\Nokia PC Suite 6\PcSync2.exe /NoDialog (User 'Default user')
O4 - Startup: Metacafe.lnk = C:\Program Files\Metacafe\MetacafeAgent.exe
O4 - Global Startup: Metacafe.lnk = C:\Program Files\Metacafe\MetacafeAgent.exe
O8 - Extra context menu item: Do&wnload by ReGet Deluxe - C:\Program Files\Common Files\ReGet Shared\CC_Link.htm
O8 - Extra context menu item: Download A&ll by ReGet Deluxe - C:\Program Files\Common Files\ReGet Shared\CC_All.htm
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\SOFTWA~1\MICROS~1\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\SOFTWARES\Java\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\SOFTWARES\Java\bin\ssv.dll
O9 - Extra button: Web traffic protection statistics - {1F460357-8A94-4D71-9CA3-AA4ACF32ED8E} - C:\Program Files\SOFTWARES\Kaspersky Lab\Kaspersky Anti-Virus 2009\SCIEPlgn.dll
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O17 - HKLM\System\CCS\Services\Tcpip\..\{651EBC7A-FCD8-4FCD-A6C2-54D441CF4710}: NameServer = 202.56.230.5 202.56.240.5
O20 - AppInit_DLLs: C:\PROGRA~1\SOFTWA~1\KASPER~1\KASPER~1\mzvkbd.dll,C:\PROGRA~1\SOFTWA~1\KASPER~1\KASPER~1\mzvkbd3.dll
O23 - Service: Kaspersky Anti-Virus (AVP) - Kaspersky Lab - C:\Program Files\SOFTWARES\Kaspersky Lab\Kaspersky Anti-Virus 2009\avp.exe
O23 - Service: FLEXnet Licensing Service - Unknown owner - C:\Program Files\Common Files\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe (file missing)
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: ServiceLayer - Nokia. - C:\Program Files\PC Connectivity Solution\ServiceLayer.exe

--
End of file - 4732 bytes

i used memtest86+ and windows memory diagnostic to check my RAMs..i have two RAMs..2gb 800mhz ddr2 & 1 gb 800mhz ddr2...checked them individually running for 8 passes...no errors were detected by the memtest86+...but when i ran the windows memory diagnostic..& selected the extended tests the test hanged at test #7, MATS+ test(Cache Disabled)..i let it run for around 6 hours but it did not progress a bit...in the standard tests of windows memory diagnostic..no errors are reported even at 15 passes..should i test with both the RAM's together in the slots?or are my RAM's ok..?
these are the error messages i have seen so far--
1.IRQL_NOT_LESS_OR_EQUAL
2.SYSTEM_POOL_DETECTED_MEMORY_CORRUPTION
3.BAD_POOL_CALLER

Apart from these i also received a 0x0000008e error without any headings like above.
what can all these mean & how do i solve this problem?

 

What happens if you boot with one stick of RAM at a time? Does it work?

Currently I am looking at either a kernel mode driver crashing or a RAM issue. I suspect its RAM...

 

Sorry i forgot to mention this before, i see the following error message too-- PFN_LIST_CORRUPT

removed the 1gb RAM 7 booted using the 2 gb only..i was trying to use system restore when it restarted again & i saw the following error--

a driver corrupted pool memory used for holding pages for disk

STOP: 0x000000DE (0x00000002, 0xE41CB0A8, 0x00000000, 0x497528C6)

after the system restarted it said that system restore was incomplete..i did not try to run system restore again & used the pc for about an hour(mainly for browsing the net) without facing any BSOD's,then as i was installing Nero-8(kaspersky antivirus was running in the background),the system just hanged & restarted with a BSOD..error message-- IRQL_NOT_LESS_OR_EQUAL,
there was no other application open when this happened.
is it wrong to install softwares to the same partition where windows is installed?i have 4 partitions--29gb, & 100gbx3, the 29 gb holds windows xp sp2 but only 8gb is shown as the used space in c: ,should i leave the remaining 21gb as it is or can i install my softwares there?

 

thanx for all your help till now...i reinstalled all of my softwares, removed the 1gb RAM stick & ran the PC on the 2gb stick only...errors are less frequent now..but the system still restarts with a BSOD--IRQL_NOT_LESS_OR_EQUAL...i am not getting any other error messages now except this...what could be the problem?