And the CPU usage remains at 90-100% all the time ?
Could this CPU usage be just a temporary problem as MSE is doing a backround operation?
This is the MSE Support:https://support.microsoftsecurityessent ... redirect=1
You can try this :
Add the MsMpEng.exe process in Microsoft Security Essential Excluded process list.
To do so, please perform the below steps:
1. Open Microsoft Security Essential program.
2. Click on Add button.
3. Select the path c:\program files\microsoft security essentials\MsMpEng.exe
4. Click ok.
5. Click on Save changes.
6. Close Microsoft Security Essential program.
7. Restart the computer.
After restarting the computer, please check the usage of MsMpEng.exe service in the Task manager window and report the results.