In the program click Help, About - you should find the version number there - the last patch was 13.0.5.4 - if yours is a lower 13.0 .x .x. number then click Help, Update online to see if there is a later patch available.
. . . . Can't find graphic card specs . . . .
Do you have a NVidia or AMD Radeon graphics card installed?
This must be a 32 bit version of Windows 7 - can you confirm by right clicking the computer icon on the desk top and select Properties there you should see a line that says System type: xx bit operating system where xxx is either 32 or 64.
Please check whether there has been a recent update to Windows 7 - since the last time you know MEP was working correctly - using this method.