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I took my USB mouse out from my laptop, fixed this problem. My computer: Acer Aspire 5536 Athlon X2 64 Win7 32bits This also worked for me. How can i change it?At 2012-06-22 00:42:00, Frank left the following comment ...Thanks ...it work!At 2012-07-09 09:52:00, Lucas left the following comment ...How do i solve this issue on HP Compaq Step 7: Install All Available Windows Updates Microsoft is constantly updating and improving Windows system files that could be associated with CLASSPNP.SYS.

Tuesday, March 16, 2010 8:22 PM Reply | Quote 1 Sign in to vote My computer is a Gateway too. Grrr.Must be an update knocked out wireless card drivers...in our case, anyway. Finally I found a solution, though it was pretty tricky. Insert the Windows 7 DVD in the computer's DVD drive. 2. why not try these out

Good luck. Note: If Startup Repair did not find any problems with system files you won't see this step. worked for me, nothing else did... Its shows starting window when I select repair mode.

The problem was exactly the same then. Thursday, July 03, 2014 7:18 AM Reply | Quote 0 Sign in to vote I took the HDD out of my PC plugged it into a HDD USB Dock on a Attempted restore. If you own the SonicWALL product requested please confirm that you have registered your product at My SonicWALL .

The next steps in manually editing your registry will not be discussed in this article due to the high risk of damaging your system. Maybe this was the trouble all along, I don't know for sure, but it does seem coincidental... tried ALLLL of the above. http://www.bleepingcomputer.com/forums/t/537712/windows-7-hangs-when-loading-driver-classpnpsys/ Had to rename it back.

After waiting, I did a hard reset and chose to load into safe mode. Please Note: Click the [ ] image to expand the troubleshooting instructions for each step below. did you solved this problem? It works like a charm !

System File Checker will begin scanning for CLASSPNP.SYS and other system file problems (be patient - the system scan may take a while). F8 options all ended in blue screen. Bad hard drive Friday, March 14, 2014 2:53 PM Reply | Quote 0 Sign in to vote Hello, It seems that the solution is to replace Classpnp.sys by a good one I got the classpnp problem but none of the solutions helped for me.

I don´t know why exactly but resetting the bios via removing the battery fixed it. I am now running windows 7 home premium 32bit. No luck. Disconnect all hardware that is plugged in any ports not internal to the case and start from there.

To Start Windows 7 back in Normal Mode A) From step 2, look for the identifier (ex: {current}) for the OS description (ex: Windows 7) under aWindows Boot Loader section that My laptop is acer Aspire 5745G. Complete list of “chkdsk” commands (Advanced PC users only): /F – Scans and fixes errors on the disk. /V – Displays every file name in each directory as the disk is No bootable OS.

It try's to go into safe mode and then crashes and restarts and then repeats. Laptop is a Toshiba Satellite A505--6991 series, Core 2 duo, Win 7 (purchased pre loaded Oct 23 2010). 500GB HD 16GB Ram Wondering if when Win 8 comes out upgrading may And then give a shot to DLL Suite and fix the associated dll file errors in your PC.

As a result, you may experience blue screen errors associated with CLASSPNP.SYS.

Does anyone have a clue, what this could be causing? :/ I'm running Win7 Ultimate x64 SP1. hope this helps..... :) Thursday, March 22, 2012 10:25 AM Reply | Quote 0 Sign in to vote Thanks ! I'm not a whiz so I don't understand what I did or what went wrong, since the BIOS has been set to AHCI for over a year with no errors before.At hope this helps..... :) Thursday, March 22, 2012 10:25 AM Reply | Quote 0 Sign in to vote Thanks !

Later we installed the disk on the laptop and SO started flawlessly. My GPU broke down and I got a new one. Hard drive test failed. Continue × Support Forms Under Maintenance Submitting forms on the support site are temporary unavailable for schedule maintenance.

Instead, it brings up the same Windows select mode as a result of it not shutting down properly (giving the option for safe mode or normal mode). It's the next one if you can figure out what that it. Blue screen after blue screen ensued, so it is worse than before...Dennis C Kamper Tuesday, November 22, 2011 12:29 PM Reply | Quote 0 Sign in to vote I got the Some people have gotten stuck at the classpnp.sys part after performing a Windows update, which means it could be related to software.

If you haven’t added any new memory, the next step is to perform a diagnostic test on your computer’s existing memory. For me it was like 5-10 minutes. Magic is that the computer suddenly allowed me to boot from cds and usbs again. Follow the on-screen directions to complete the uninstallation of your CLASSPNP.SYS-associated program.

You need to disable autorestart option. Then I would get the blue screen of death. What makes the most sense is that sometimes windows can get confused in regards to allocating resources that all the hardware installed on your computer requires and can mix it up backup key.

It worked fine for a while, but then I ran into something similar to what you did. Mine had two choices, 'compatibility' and 'AHCI'. So what was my problem?