I guess you installed the latest full version, otherwise uninstall your current version, download and install the most recent full installer([IP address redacted]). Are you using XP?
If you already have the latest version, as I don't know what happened with your PC and never heard of such thing before(your problem happens because you don't have admin rights or you don't have .NET framework 3.5), I suggest to make a shorcut for Eastern Front. In this topic you can find instructions about it:
How to create an Eastern Front shorcutMors Indecepta
Might controls everything, and without strength you cannot protect anything. Let alone yourself...