Classpnp.sys – Repair & Free Download for Windows 7/8/XP/Vista

What is Classpnp.sys?
Classpnp.sys, also written as SCSI Class System Dll, or Classpnp, is a shared library for cipher (cipher.exe) and x3daudio1_7dll download in computers installed with Microsoft Windows 7, Windows 8, Windows Vista and Windows XP, including 32 bit and 64 bit operating systems. DLL Classpnp.sys is associated with 178752 system files and most of them are used to execute software programs like Dark Age of Camelot, Kaspersky PURE and Safari 534.51.22.

Symptoms of Classpnp.sys error:
When there is problem with file Classpnp.sys, your computer would have the following error symptoms:

  1. Classpnp.sys is missing, cannot find Classpnp.sys, can’t load Classpnp.sys
  2. cipher (cipher.exe) was not found
  3. shellstyle (shellstyle.dll) blue screen of death (BSOD)
  4. x3daudio1_7dll download is missing from your computer during Dark Age of Camelot startup
  5. Classpnp.sys error in Windows startup and registry
  6. 2/two cipher (cipher.exe) in Task Manager and high CPU/Memory usage
  7. Classpnp.sys entry point not found when running Safari 534.51.22

How to fix and repair Classpnp.sys problems?
If Classpnp.sys error is not repaired as soon as possible, your computer would no longer work correctly. To resolve Classpnp.sys issue, you need Classpnp.sys file fixer. Olevia Beckenbach, a web traffic analysis expert from, said a total of 3536003 Classpnp.sys solution requests since 7/13/2009 4:19:59 PM. He also mentioned the effective way to fix Classpnp.sys error is to use DLL Suite.

How to use DLL Suite to fix Classpnp.sys?
The idea behind DLL Suite is to make every DLL repair become easier, even common computer users can make this complicated work done with 3 mouse clicks. For the Classpnp.sys repair, what you need to do is to download DLL Suite, scan your computer and then repair Classpnp.sys problems.

The cause of Classpnp.sys error:
The data published by Kaspersky PURE shows why you got Classpnp.sys error is because of Trojan:Win32/Adialer.FK infection. Landon Medrano, the leader in Kaspersky PURE antivirus center, said around 178752 computers were infected by Trojan:Win32/Adialer.FK everyday. When Trojan:Win32/Adialer.FK loads, it starts to download and install malware Program:Win32/BaiduIebar from At the same time, Trojan:Win32/Adialer.FK will collect private information from the affected machines and then upload these data to the remote server through electronic means.

Trojan:Win32/Adialer.FK will close and delete itself after Program:Win32/BaiduIebar installation. The most severe issue next is Program:Win32/BaiduIebar will scan your computer, display around 3536003 false system errors and ask you to pay to clean them to fix Classpnp.sys problem. If you take these so-called recommended actions, you would receive Classpnp.sys blue screen of death during your system startup and Dark Age of Camelot operation.

Classpnp.sys FAQs you might like:

Q: Can my Kaspersky PURE help fix Classpnp.sys problems?
A: If your Kaspersky PURE only removes and deletes Trojan:Win32/Adialer.FK virus from Classpnp.sys, it would help fix Classpnp.sys error. But the real truth is most of the antivirus software programs not only remove Classpnp.sys virus, but also delete file Classpnp.sys. That is why you still get Classpnp.sys is missing error after Trojan:Win32/Adialer.FK removal.

Q: Can I uninstall Program:Win32/BaiduIebar to fix Classpnp.sys error?
A: If you got Classpnp.sys error after Program:Win32/BaiduIebar installation, you can try software uninstalling to solve Classpnp.sys issue. But so far none of the computer users have the luck; this is because the DLL introduced by Program:Win32/BaiduIebar re-writes Classpnp.sys and changes Classpnp.sys registry entries. That is why you see Classpnp.sys blue screen of death after registry cleanup by Program:Win32/BaiduIebar.

Q: Can I upgrade SCSI Class System Dll driver to stop Classpnp.sys blue screen on my NEC computer?
A: Updating SCSI Class System Dll driver is the most used way to solve Classpnp.sys problem, but it is not a recommended workable solution, especially when there is error in Classpnp.sys associated file: x3daudio1_7dll download and shellstyle (shellstyle.dll). To determine if there is problem with both of these 2 files, you can use DLL Suite to scan your computer and check if they are listed in the scan results.

Q: Can I fix and install Classpnp.sys file manually?
A: The answer is absolutely YES and the whole process is easy. What you need to do is to:

    1. Retrieve Classpnp.sys from your system setup disk, another PC running the same system with yours, or through DLL Suite database.
    2. Save Classpnp.sys to C:WindowsSystem32winsxsamd64_microsoft-windows-classpnp_31bf3856ad364e35_6.1.7600.16385_none_71782042c5c2dbe9
    3. Type regsvr32 Classpnp.sys and press Enter in CMD window

Q: Can I use DLL Suite to download Classpnp.sys file for free?
A: The answer is absolutely YES. DLL Suite not only helps fix Classpnp.sys problem automatically, but also allows its users to download Classpnp.sys for free. Since 7/13/2009 4:19:59 PM, a total of 3536003 Classpnp.sys downloads has been taken by DLL Suite users and 178752 of them chose the paid version to resolve Classpnp.sys issue automatically. To start Classpnp.sys download, please download DLL Suite and then take the recommended instruction on the software interface.

How to prevent Classpnp.sys error?
Classpnp.sys problems can arise due to many aspects, including Trojan:Win32/Adialer.FK virus infection, malware Program:Win32/BaiduIebar, antivirus Kaspersky PURE installation, missing x3daudio1_7dll download, out-of-date SCSI Class System Dll driver, etc. To fix and prevent Classpnp.sys error, you can take the following methods:

  1. Keep your SCSI Class System Dll driver up-to-date and all of your DLL versions are correct with DLL Suite. Download DLL Suite
  2. Clean up invalid registry keys of Classpnp.sys with UniOptimizer. Download UniOptimizer
  3. Keep your computer is Trojan:Win32/Adialer.FK and Program:Win32/BaiduIebar free by using anti-spyware Hit Malware. Download Hit Malware



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