Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Classpnp.sys error !Please Help!

11 May 2012   #1

Windows 7 Home Premium x64
Classpnp.sys error !Please Help!

I am new to fourms and I would like some help. Basically I had a Windows 7 Home premium OS x64bit and it was working fine until I installed Windows 7 Ultimate on a separate partition on the same hard drive. Before i done that i changed the disk from dynamic to basic. After the installation was finished it did give me an error but I couldnt read it becuase the computer restarted. Now I have to wait 20minutes at the windows logo screen for both OS to load to desktop. When I use the safe mode it is getting stuck at Classpnp.sys for 20mins and loads. Also I am finding it hard to install my ATI display driver on the new OS as it is saying driver not supported. Any help is greatly appreciated and sorry for the long information.

Here are my specs:
Processor: Intel core i7 870 @ 2.93GHz
Memory: 6144MB RAM
VG Card: ATI Radeon HD 5570
Motherboard: ipowerG5800 [I think]


My System SpecsSystem Spec
11 May 2012   #2
Hanna 1

win7 home premium-64bit-SP1-IE10

Hello Harry
Take a look at this thread:

Good luck
My System SpecsSystem Spec

 Classpnp.sys error !Please Help!

Thread Tools

Similar help and support threads
Thread Forum
BSOD while classpnp.sys classpnp.old (Safe Mode)
Hello, I have recently taken the hard drive of my laptop and connected it to my desktop computer. The name of the hard drive is ; WD2500B EVS - 60 USTO (250GB). However when I try to boot from using windows 7 than I get a BSOD but when I boot it using ubuntu it works. The Hard Drive is dual...
BSOD Help and Support
Another classpnp.sys hangup
Same story. Machine, in this case a Dell Inspiron 32 bit, suddenly refuses to boot. I can get as far as the login, hit a profile and the welcome screen hangs. Try to boot in safe mode and it sticks on classpnp.sys. I've scoured this and other forums for a solution and found only two. Reformat...
General Discussion
Classpnp.sys Problem among others
Hi, I am new here although I have been reading the forum and always found the answers in others' situations, until now. I am not an expert but I will try to explain what happens and what I tried to do so far. It is a Pentium Dual Core E2220 2.2ghz, MB MSI P6NGM-L, HDD WD 160GB, 1x2GB RAM...
BSOD Help and Support
Another classpnp.sys problem
Hello I just installed windows 7 ultimate x32 on my pc.After i installed it for 5 mins the pc was running great but after it began to run slow. I restarted the pc and chose safe mode, but it stuck at classpnp.sys file for 10-15 min . I looked at some threads on the internet ,tried some stuff but...
General Discussion
I was wondering if someone running Windows 7 Ultimate 64-Bit (RTM) would be willing to either zip or upload their Classpnp.sys file for me. Mine appears to be corrupt and I'd like to attempt to replace the one I have with a functioning one. It's located in C:\Windows\System32\drivers It...

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 12:07.
Twitter Facebook Google+ Seven Forums iOS App Seven Forums Android App