Troubleshooting:classpnp.sys issue - Need recovery/reinstallation disk Error

classpnp.sys issue - Need recovery/reinstallation disk

Suddenly my Windows 7 is not moving beyond the windows logo at the start up, i tried in safemode and its getting stuck at 'classpnp.sys'.
I search for this probelm and its seems many suffered with it.
I dont have a recovery disk or reinstallation disk.
But i do have the product key at the back of my  laptop, is it possible to download reinstallation/recovery disk from Microsoft?

Keys to the Problem classpnp.sys issue - Need recovery/reinstallation disk

Download SmartPCFixer to Fix It (Free)

Manually editing the Windows registry

Manually editing the Windows registry to remove invalid MACHINE_CHECK_EXCEPTION keys is not recommended unless you are PC service professional. Incorrectly editing your registry can stop your PC from functioning and create irreversible damage to your operating system. In fact, one misplaced comma can prevent your PC from booting entirely!


Caution: Unless you an advanced PC user, we DO NOT recommend editing the Windows registry manually. Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. We do not guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

To manually repair your Windows registry, first you need to create a backup by exporting a portion of the registry related to MACHINE_CHECK_EXCEPTION (eg. Windows Operating System):

  • Click the Start button.
  • Type "command" in the search box... DO NOT hit ENTER yet!
  • While holding CTRL-Shift on your keyboard, hit ENTER.
  • You will be prompted with a permission dialog box.
  • Click Yes.
  • A black box will open with a blinking cursor.
  • Type "regedit" and hit ENTER.
  • In the Registry Editor, select the Error 0x9C-related key (eg. Windows Operating System) you want to back up.
  • From the File menu, choose Export.
  • In the Save In list, select the folder where you want to save the Windows Operating System backup key.
  • In the File Name box, type a name for your backup file, such as "Windows Operating System Backup".
  • In the Export Range box, be sure that "Selected branch" is selected.
  • Click Save.
  • The file is then saved with a .reg file extension.
  • You now have a backup of your MACHINE_CHECK_EXCEPTION-related registry entry.

Another Safe way to Repair the Problem: classpnp.sys issue - Need recovery/reinstallation disk:

How to Fix classpnp.sys issue - Need recovery/reinstallation disk with SmartPCFixer?

1. Click the button to download SmartPCFixer . Install it on your system.  Open it, and it will perform a scan for your computer. The junk files will be shown in the list.

2. After the scan is finished, you can see the errors and problems need to be repaired. Click Fix All.

3. The Fixing part is finished, the speed of your computer will be much higher than before and the errors have been removed.


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