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There has been an issue detected with the DAT file's virus definition with McAfee. This particular issue is causing a false recognition of the W32/wecorl.a as a bug in the process of Svchost.exe. With this false positive detection chances of quarantining or removing Svchost.exe increases completely depending on the configuration of the software.
Such a behavior may lead to some issues like:
The PC shuts down at the occurrence of a RPC error or a DCOM error.
The computer runs without any network connectivity available.
The PC abruptly triggers blue screen STOP errors.
It is a well known issue and Win XP SP3 is the only version that is affected.
You can however manually repair the computer's issue with McAfee false detection.
You need to start the computer in safe mode by tapping the F8 key when the computer restarts and before the splash screen of Windows appears.
While the PC is in safe mode, press the CTRL+ALT+Del to activate the Task Manager of Windows.
Go to the File Menu tab and click on New Task and Run.
In the name field of New Task put in cmd.exe and continue with hitting ENTER.
Now rename Avvscan.dat so as to prevent Svchost.exe from getting removed by McAfee till an updated form of the DAT file is available and installed.
You need to understand that this step the virus definition of McAfee. Once the steps are complete, make sure to get the latest virus definition files of McAfee.
Now restore Svchost.exe to system32 directory. A backup however gets by default stored in the folder -DLLCACHE.
Once all the steps are done successfully, restart the machine.
You can refer to the following commands for the mentioned actions:
For renaming:
ren "%CommonProgramFiles%\McAfee\Engine\avvscan.dat" avvscan.old
For copying:
copy %systemroot%\system32\dllcache\svchost.exe %systemroot%\system32\
In case the command fails and shoots an error -the system is unable to find the specified file, you need to verify the syntax again.
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