We have great success using /agent=install /forceinstall
If you wants to reinstall the MA on a single machine kindly use this command for uninstallation
1)Type CMD fron run (make sure that u have admin rights)
2) Type cd C:\program files\McAfee\Common Frameworks
3)run the command frminst /remove=agent and press enter
if you wants to reinstall more than one PC from ePO console kindly follow the procedure
1)log in in to the ePO console
2) select the PC's that u wants to reinstall the McAfee agent
3)then select the Actions TAB-Agent Option-Deploy agents
4)enable the check box " force installation over existing version"
5)type the credentials like domain name username and password then click ok
Hope this will helps u.....
If you have physical access to the node I usually opt for manually uninstalling via the "Uninstall String":
Same holds true for a corrupt VSE uninstall.