Not sure if you have done any damage.
This taken from the McAfee web site on how to remove McAfee should help.
Download and run the McAfee Removal tool
NOTE: Always be sure to uninstall your McAfee product through Add/Remove Programs, first. The following steps should only be taken if uninstalling through Add/Remove Programs has failed.
Download the removal tool from click here.
Click Save and save the file to any folder on the computer.
Navigate to the folder where the file is saved.
Make sure all McAfee application windows are closed.
Double-click MCPR.exe and the removal tool will start automatically.
Note: Windows Vista users must right-click and select Run as Administrator.
Once the removal tool is finished, you will be prompted to restart your computer. If you choose to restart later, your McAfee product will not be fully removed until you do.
Wait for the computer to restart.