It appears you are having problems with MSE
About this time I noticed another problem. By now Microsoft Security Essentials regarded my PC as invalidated and using invalidated software, so it stopped working!
Your other topic
which you started just an hour ago, is to some extent, similar to the problem that did exist here.
Fragments of previously installed AV ;programs, CCleaner, Advanced System Care and other such programs can cuase these problems.
The fragments of the previously installed Anti Virus, may conflict with MSE and the usually provided uninstall/clean utility from the AV provider should be used.
In the case of AVG the AVG removal tool should be used.
Other AV providers tools can be found from their respective websites
Insofar as relates to the actual errors both here and particularly on the other topic, the use of the CCleaner, Advanced system care and the like delete the MSE history file and is a well known cause of these errors.
I have also posted the same reply on the other topic