Laptop hangs up at Classpnp.sys file.

Anonymous

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!!!

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Anonymous

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

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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135 additional answers

Anonymous

2011-04-10T11:50:41+00:00

why cant i see this post??
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Anonymous

2011-03-24T17:35:03+00:00

I had same problem, Lenovo 3000 N200 not booting after Win7 update and bios upgrade. I just disabled "Sata HDD AHCI Mode" in bios, so now it runs in IDE mode. Maybe slower but who cares, it works ;)
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Anonymous

2011-03-20T23:28:35+00:00

Hi guys,

I have the same problem. I have installed Windows Server 2008 R2 and as soon as i install AD to make it a domain controller it just get stuck on the window logo where you got the bars moving from left to right. I now have checked with safe mode and it is not going further and can not load CLASSPNP.SYS file in the \windows\system32\drivers directory.

This is my 5th time i've tried to make my server a domain controller. Which has 4GB of RAM and 2x160GB of hard disks.

Can it be the disk which might me faulty. Any help would be much appreciatable.

Thanks
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