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How to eliminate vmm driver problems

The vmm.sys (Virtual Machine Monitor) file is a Windows driver. Generally, drivers are used by Windows to enable internal components like graphic cards and drives, or external devices, such as printers, backup media or input devices.
Click here to check if you need to update your vmm driver.

The vmm.sys process is also known as Virtual Machine Monitor and is a part of Microsoft Virtual Server (Version 2005 R2 SP1) or, as the case may be, Virtual PC. This software is produced by Microsoft (www.microsoft.com). An obsolete or defective version of vmm.sys can cause problems for your computer that can range from slowness to error messages such as these:

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What you should know about vmm.sys Virtual Machine Monitor

vmm.sys is not a Windows system file and is known to frequently cause computer problems. Vmm.sys is found in the C:\Windows\System32\drivers directory. Frequently occurring are file sizes such as 147,040 bytes (28% of all these files), 232,816 bytes, 229,208 bytes or, as the case may be, 151,784 bytes.
If necessary, you can manually stop or start this driver in the Device Manager. The Device Manager can be found in Windows Control Panel under Hardware and Sound/Devices and Printers/Device Manager. The driver facilitates access to your computer's hardware and accessories. The application does not have a visible window, and does not appear on the taskbar. The original file has a digital certificate (see its file properties). There is no concrete documentation available for this service. Vmm.sys is no part of Microsoft Windows. vmm.sys appears to be a file that was compressed by an EXE-Packer. This technique is often used by trojans to keep the file size small and also hamper debugging efforts. However, this in itself is not sufficient reason to presume malicious intent, since even well-intentioned, professional software producers take advantage of compressed files. For this reason, 27% of all experts consider this file to be a possible threat. The probability that it can cause harm is high.

If you see this file on your hard drive or in Windows Task Manager, please make sure that it is not a malicious variant. It's a fact that many trojans try to cloak their true identity by calling themselves vmm.sys. With the above information or by using tools like Security Task Manager you can determine if, in your case, the file is an undesirable variant.

What do other computer users say about vmm?

Part of Microsoft Virtual Machine (further information...)
tmahn642
My antivirus detected this and another driver as a hidden driver and rootkit
dkfjdsjs
It's nonessential, but it can be forged by some viruses, like the one that hijacks your browser to 100ksearches.com
angolmois

Summary: One user considers it harmless. However, one user considers this to be a suspicious process and would like to get rid of it. source: file.net

How to uninstall Microsoft Virtual Server or Virtual PC

vmm.sys  Virtual Machine Monitor fix

To remove Virtual Machine Monitor from your computer, please follow the manual instructions below or use an automatic uninstaller product.

  1. Click the Windows Start Button. In Windows 8, look for Control Panel.
  2. Click Control Panel.
  3. Click Uninstall a program.
  4. Look for Microsoft Virtual Server or Virtual PC in the list of available programs.
  5. Click Uninstall.

How to tell if vmm.sys (Virtual Machine Monitor) was uninstalled cleanly

After uninstalling, restart your computer. Then start Windows Explorer and see if there is still a folder with the name of the software under C:\Program Files. Be sure to check the Registry as well for remnants of Virtual Machine Monitor. To do this, start "Regedit", then look under "HKEY_LOCAL_MACHINE" > "Software" for Virtual Machine Monitor or the name of the producer. Always keep in mind that only a computer professional should ever directly delete entries in the Windows Registry.

What to do if a program does not uninstall

The easiest way to remove any kind of software cleanly and accurately is to use an uninstaller tool. Because the uninstaller automatically creates a backup, there is no risk of anything going wrong.

Last but not least

If Windows not working quite right for you, or if startup is taking a long time, or vmm.sys is causing problems for you, a good Registry Cleaner may very well help. This is especially effective when it comes to older computers that have accumulated vast quantities of "garbage data" as the result of many software installs and uninstalls.

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