McAfee Virus Scan Error Message

Hi expert,
I need to solve the following error message. Please help me.
This error message can be occurred due to a number of factors:

McAfee VirusScan
Some component of ActiveShield are either missing or might not have been installed properly. Please reinstall ActiveShield.
If you have started your computer in safe mode, please restart your computer in normal mode to enable McAfee VirusScan.
OK
