If you are one of those Windows XP users that downloaded the latest McAfee security patch on Wednesday, then you are in for a big surprise as McAfee released a erroneous security patch. However if you are working on Windows Vista or Windows 7, then you won’t have to worry about anything as the patch is working perfectly fine on these Operating Systems.

If you feel that after installing the security patch your computer is behaving in the following manner:

  • Automatic shutdown
  • Slow Internet browsing
  • Poor PC performance

Then it is necessary that you take a quick remedial step to fix this problem.

If your computer is automatically shutting down, please type the following command in your command prompt as follows:

  • Step 1: Open a command prompt: Start menu, Run, then type cmd and hit Enter
  • Step 2: Type shutdown -a, which will prevent the shutdown from occurring

Once you have completed these steps you would need to follow two separate steps to fix the problem completely. In the first series of these steps, please follow the commands as follows:

  • Step 1: Click Start, Programs, McAfee, and then VirusScan Console
  • Step 2: Right-click “Access Protection”
  • Step 3: Select “Disable”

Now in the second step you have to download the correct security patch update. To do this, please follow these steps:

  • Step 1: Download EXTRA.ZIP, from the McAfee site and unzip to get EXTRA.DAT
  • Step 2: Click Start, Run, then type services.msc and click “OK”
  • Step 3: Right-click the McAfee McShield service and select “Stop”
  • Step 4: Copy EXTRA.DAT to “\Program Files\Common Files\McAfee\Engine”
  • Step 5: Then restart the McAfee McShield service by right-clicking on it and choosing “Start” from the context menu
  • Step 6: Re-enable access protection by going back to the VirusScan Console
  • Step 7: Right-click “Access Protection”
  • Step 8: Select “Enable”
  • Step 9: In the VirusScan Console, go to the Quarantine Manager Policy
  • Step 10: Click the Manager tab
  • Step 11: Right-click on each file in the Quarantine and choose “Restore”

Once you have completed all these steps, your PC will function normally with the new patch. All that we have done is these steps is disabled the erroneous patch and enabled the correct patch.