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Windows 7 Install Stops Then Restarts At Classpnp.sys

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Classpnp.sys Windows 7

KRISTIAN JURICEV asked on March 21, 2013. Status: Answered & Closed.

Windows 7 Install Stops Then Restarts At Classpnp.sys

» So basically I have Windows 7 installed on a 250GB Seagate external HD. I can boot it with no problems using a VM in VMware Workstation 7.1.3, but whenever I try to native boot it, it takes a long time to load and when the 'starting windows' is reached a blue screen flashes and then the machine reboots. I tried to run it in safe mode, but it reached Classpnp.sys and then rebooted.


Best Answer

» If you try running Windows 7 in Safe Mode, it fails at Classpnp.sys(Microsoft Windows SCSI class system file). What we figured out was that this issue could be related to a couple of things. The first thing to try is the startup repair or system restore using the DVD. You can read online how to boot from DVD and get to these options. There are a ton of guides out there, so I won’t repeat that info. Just make sure to go into the BIOS and set Boot from CD/DVD as the 1st priority above Hard Disk.

If that doesn’t work, try restarting Windows in Debugging Mode. You can restart the computer and press F8 to get a list of boot options, which includes Safe Mode, Last Known Good Configuration, etc. Sometimes Windows will load in debugging mode and then you can restart the computer and it will start up in normal mode fine.

We also need to be clear of the fact that Classpnp.sys Files may be infected by malware(Trojan:JS/BlacoleRef.CZ),resulting in blue screen of death. DLL Suite is thus designed to fix this kind of error by providing a blue screen fix with the feature of Fix BSOD. After a antivirus scan, please just do as follows:

Download DLL Suite, install and run > Click Dashboard menu and > Click Scan DLL Errors button > Click Fix DLL Errors button after the scan 

In DLL Suite’s Dashboard menu, there is a built-in feature of Fix BSOD, which aims to remove all .sys file related problems automatically.

JENNIFER FOX replied on March 27, 2013


All Answers:

  1. DANIEL ZINK replied on March 21, 2013: » Hi, sounds like you have a corrupted system file , have a look at this excellent tutorial SFC /SCANNOW : Run in Command Prompt at Boot

  2. KRISTIAN JURICEV replied on March 22, 2013: » I have followed that tutorial, but I'm still having the same issue.I used this tutorial to install Windows 7 on the USB HD - Install Windows 7 on a USB Stick/Flash drive « Techno-Cranio Idiocracy

    Also, I am trying to run Windows 7 from the USB on a Macbook Pro 5.5. I have tried it on a windows based laptop, but there is still the same issue.

  3. D COOK replied on March 22, 2013: » Try the following resolution:1. Boot the computer to windows recovery mode.2. Click Commmad Prompt, type in:rename c:\windows\system32\drivers\classpnp.sys classpnp.old. Note: I assume that your windows is installed on C drive. I have tested this step, it will not crash your system.

  4. WILLIAM BEECHER replied on March 23, 2013: » Try a in-place upgrade to repair the corrupted files:1. Insert the Windows 7 DVD in the computer's DVD drive. 2. Click Start and choose Computer.3. Please find the "setup.exe" file in the DVD-ROM and double click it.4. Click Install now. 5. When we are prompted to input the product key, please click Next without inputting any key. The setup wizard will prompt and ask if you agree to install Windows 7 without the key. Please choose to confirm.6. When you reach the "Which type of installation do you want" screen, click Upgrade to upgrade the system files of Windows Vista.

  5. HEIDI WATSON replied on March 25, 2013: » My computer is a Gateway too. I started to have this problem after installing the Sniper Ghost Warrior game. After boot, system just stopped to boot in 'Windows is starting'. What I did:Into BIOS, reseted all configs to default. Than, reboot and, inside the BIOS (again), reset system to your old configs; Restart Windows and everything should work fine. (I had this idea when I read that this classpnp.sys was a hardware file)