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BSOD Win 7 Problem

If you could give me any guidance as to how to go about resolving this problem, I would be most grateful.  

I am running a Lenovo x200 laptop with 3gb memory - Windows 7 Professional - build 7601 - SP1

I got the BSOD on Friday with a non page error.  This is what BlueScreen View gave me.  I have attached the actual dmp file as well.  

Dump File         : 081712-31075-01.dmp
Crash Time        : 8/17/2012 8:20:34 PM
Bug Check Code    : 0x00000050
Parameter 1       : 0x8d642000
Parameter 2       : 0x00000001
Parameter 3       : 0x83056853
Parameter 4       : 0x00000000
Caused By Driver  : halmacpi.dll
Caused By Address : halmacpi.dll+5b48
File Description  : Hardware Abstraction Layer DLL
Product Name      : Microsoft® Windows® Operating System
Company           : Microsoft Corporation
File Version      : 6.1.7601.17514 (win7sp1_rtm.101119-1850)
Processor         : 32-bit
Crash Address     : ntkrnlpa.exe+8e3ff
Stack Address 1   : ntkrnlpa.exe+41478
Stack Address 2   : ntkrnlpa.exe+39853
Stack Address 3   : ntkrnlpa.exe+810cb
Computer Name     :
Full Path         : C:\Windows\Minidump\081712-31075-01.dmp
Processors Count  : 2
Major Version     : 15
Minor Version     : 7601
Dump File Size    : 147,136
2 Solutions
This Stop message usually occurs after the installation of faulty hardware or in the event of failure of installed hardware (usually related to defective RAM, either main memory, L2 RAM cache, or video RAM). If hardware has been added to the system recently, remove it to see if the error recurs.


Try to run memory test and check your hard disk for errors (run chkdsk).
Kelly HasenmuellerComputer Systems Administrator Commented:
Rob MinersCommented:
Probably caused by : Apsx86.sys ( Apsx86+3984 )

Apsx86.sys   Thu Jun 18 17:21:34 2009

This driver belongs to the ThinkVantage Active Protection System. You can find an update for it on the Lenovo site.

RobertaGelbAuthor Commented:
I think I accidently came upon the solution which may very well have been the apsx86.sys problem.  I tried a number of things and finally got the PC up in Safe mode.  After trying a number of solutions, I was able to update Norton and Lenovo.  Unfortunately, I missed suggestions #2 and #3 which would have probably been helpful so I am accepting those two solution and I thank you both for the help
Rob MinersCommented:
your welcome :)

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