Laptop hangs up at Classpnp.sys file.

Anonymous
2009-10-30T12:33:24+00:00

So I installed Windows 7 the other night on my laptop.  I did the driver updates and installed Norton.  I also installed Office 2007.  Then I shut it down for the night.  The next day I turned it back on to install a few more things.  A friend recommended that I install Ad-Aware, so I did, and ran it.  I've used it on a few of my machines before with no problems.  I installed a couple more programs (SANDRA & CPU-ID) then I shut it down for the night.  It stalled on shutdown.  I didn't think anything about it and after about 20 minutes I did the power-off.  I started it up the next day and it now hangs at the starting windows screen.  I've tried the following with all the same results:

  • System repair - hangs at the repair screen
  • Start normally - hangs at the starting windows screen
  • Start in safe mode - hangs at the classpnp.sys file
  • Start in safe mode with command prompt - hangs at the classpnp.sys file
  • start in safe mode with networking - hangs at the classpnp.sys file

I've even tried to put in the windows 7 disc back in to do a re-install and it hangs at the starting windows screen.

It seems like no matter what I try I get the hang up at the windows starting screen.

Someone help, please!!!

Windows for home | Previous Windows versions | Windows update

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Anonymous
2009-11-08T15:10:27+00:00

So the other night I tried a few more things with all the same results.  Here's what I tried:

  • I bought a second gig of ram, so I tried swopping out one stick, then the other - same results.
  • I bought a hard drive enclosure, removed the hard drive, formatted it with another computer, made sure I could save things to it, re-installed hard drive, booted from CD - same results.
  • I bought a brand new hard drive, installed it, booted from CD - same results.
  • Put old hard drive back in with both sticks of ram - same results.

After reviewing a few things, I found that when Windows gets to the "Starting Windows" screen, it's checking your hardware to make sure that things are OK.  Well, my hard drive, RAM, CD Drive, and Video Card are OK (I get all the right video stuff), so there's only a couple of things left, and one is the motherboard.  So, I believe that there is a hardware issue that is not allowing Win7 to completely load.

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Anonymous
2010-12-13T17:26:25+00:00

Go into your bios and check the hard drive configuration.   Once I reverted back to IDE the system booted as normal.  You may have to do the opposite!!!

At all times my system hung at classpnp.sys as advertised.  Let me know if this fixed

Macbionik.com

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  1. Anonymous
    2011-04-16T18:21:21+00:00

    I hit this problem and had tried everything I could find over the last couple of days. It was frustrating because windows would always hang so I could not access the disk. I even loaded my Suse Linux boot CD but I could not access the HD. Eventually I found out about <ALT-F10> (just keep hitting it after powering up the system). I was presented with a Boot Options page. It had a line in it that said "/NOEXECUTE=OPTION/MININT". I hit the <delete key> to remove this text and hit <ENTER>.  The system rebooted, got to the "Starting Windows" message (where it would always hang), continued, did a disk check and then came up so I could login. Hope this helps somebody. It appears the solution to this problem varies by system. If there are any Windows Geeks out there, I would love to know the details of what actually happened. Thanks.

    I don't know what the heck this did, and I'm going to do a system restore just in case... but I COULD NOT GET IN BEFORE AND YOU ARE A LIFESAVER. THANK YOU GOOD SIR, ONE MILLION BLESSINGS UPON YOU.

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  2. Anonymous
    2011-04-16T03:44:27+00:00

    I've had this problem several times today (once after repartitioning my hard drive, twice after attempting to change my mouse polling rate - I couldn't believe that I was getting the same kind of error from an action so different). You have to change the BIOS settings on your computer to IDE compatible mode, or some equivalent. This is actually a setting meant to enable compatibility for Windows XP installation, and it's weird that it's the only thing that seems to work here (Vista and 7 are fully compatible with SATA, so the option should be irrelevant). I'd recommend changing it back afterwards, though, because it probably slows down your system.

    After that, I have to boot to the command prompt with startup repair, type c:, and then run chkdsk /f. If Windows tries to automatically fix things for you, just cancel it and go to the advanced options. The automatic fixer will take forever and won't produce a result.

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  3. Anonymous
    2011-04-12T15:27:19+00:00

    I am working through the exact problem at the moment.  Identical symptoms.  It's a Dell with diagnostics.  I've run every last option in the diagnostics and the system passes.  The fact that it won't run the install from the Windows 7 disc makes me think it's a hardware issue regardless of what the diag says.  The system is still under warranty so Dell is shipping out a preloaded hard drive.  That will eliminate the OS as an issue.

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