How To Repair Parallels Virtual Machine

Symptoms

Windows performance is degraded.
Parallels Tools installation fails.
Virtual machine often crashes.
I am unable to install application in Windows.

Cause

Windows file system/registry corruption.

Resolution

Open up Windows Beginning bill of fare, in Search bar type cmd, right-click on the appeared Command Prompt awarding and choose Run as Administrator.
In Command Prompt execute the control below:
chkdsk /f /r
When asked to schedule checking disk, type y, and press "Enter" once again. Reboot Windows and wait until the CHKDSK finishes checking the disk and set up the detected errors if such were establish.
Open up Command Prompt over again as Administrator and execute the following command:

sfc /scannow
Wait for the scanning and the repairing processes to finish.

There is a hazard you might get the following message at the cease of the scanning procedure:

                              Windows Resource Protection constitute decadent files but was unable to fix some of them. Details are included in the CBS.Log windir\Logs\CBS\CBS.log. For example C:\Windows\Logs\CBS\CBS.log. Note that logging is currently not supported in offline servicing scenarios

It means that typical scanning/repairing utility is not enough to set Windows files corruption, to exist able to fix it, please practice not close Control Prompt window and continue with the instructions:

In Command Prompt execute the following commands one by one:

              DISM /Online /Cleanup-Epitome /CheckHealth DISM /Online /Cleanup-Image /ScanHealth DISM /Online /Cleanup-Paradigm /RestoreHealth

DISM commands

In instance you have Windows installation media (CD/DVD disk or .iso prototype), please do the post-obit:
Make certain Windows is connected to the Internet.
Insert CD/DVD or put an .iso file to the easiest location on the Mac to utilize it later on.
From Mac superlative menu choose Devices > CD/DVD
If you use physical CD/DVD, choose CD/DVD bulldoze from the listing.
If you use .iso image, choose Connect image... and navigate to the image location.
Double-click it and check that it appeared inside Windows equally bulldoze D:

In Command Prompt execute the commands from pace 7 one past one inverse in the post-obit way:

              DISM /Online /Cleanup-Image /CheckHealth /source:wim:D:\sources\install.wim:1 /limitaccess DISM /Online /Cleanup-Prototype /ScanHealth /source:wim:D:\sources\install.wim:1 /limitaccess DISM /Online /Cleanup-Paradigm /RestoreHealth /source:wim:D:\sources\install.wim:i /limitaccess

where D: is the Windows installation image mounted in a virtual drive.

Wait until the operation is completed. This usually takes 20-xxx minutes.

Restart the virtual machine.
If the situation did not modify after the restart, the but thing left is to reset Windows.

If Windows updates fail to install, the operating system repair method from the official Microsoft noesis base of operations may help.