Moved this to Home User Assistance which I have assumed is the correct spot, if this is a corporate/business product then please clarify your post in English with details of what McAfee products you are using.
Try the steps outlined here first: http://community.mcafee.com/docs/DOC-1294
If that fails, download, install, update (important), then run the free version of THIS software.
That error can also mean that a recently installed software and/or driver is unsigned.
Sorry but we only speak English here.