PC hangs at classpnp.sys

Although there are multiple solutions, the one I think worked for me is that it was the file loaded just before classpnp.sys that caused the issue and in particular i think it was an anti-virus software that had cleaned the file loaded before classpnp.sys and had left it present but with a file size of 0bytes, so rather that a message coming up saying missing file, it just hangs. Or the file might just need replacing from a fresh copy. It is similiar to the mup.sys issue i had in xp.

https://social.technet.microsoft.com/Forums/windows/en-US/6115cb34-2890-46b5-8c1e-c934c56ecfe4/booterror-when-changing-harddisk?forum=w7itprohardware

social.technet.microsoft.com/Forums/windows/en-US/6115cb34-2...

I have a problem with booting Windows7 right after I changed disks.

  • I work with removable harddisks (2 with Windows XP and now 1 with Windows 7 RC1).
  • Working with XP is alright.
  • Working with Windows 7 is also OK.
  • ...

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http://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/pc-hangs-at-classpnpsys-loading/8c9eebeb-1c2e-4389-8a9f-20fb09fe9c93

answers.microsoft.com/en-us/windows/forum/windows_7-hardware...

When I boot my pc it freezes forever at CLASSPNP.SYS loading.  (  I don't remember how I did it  but I managed to get a kind of boot log on a screen)   I have to push  reset button again and again and suddenly after  sever ...

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https://social.technet.microsoft.com/Forums/windows/en-US/566cdd43-ce91-4e64-93e0-8d09d8fc1ea0/windows-7-fails-to-go-into-safe-mode-stuck-at-classpnpsys?forum=w7itprogeneral

social.technet.microsoft.com/Forums/windows/en-US/566cdd43-c...

I wanted to go into safe mode on windows 7 but it kept stopping at classpnp.sys . After reading a few threads I read about using Msconfig and checking the safe mode option under "Boot". It still keeps staying at classpnp.sys and when I hit F8 and hit " ...

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