"to reapair any damage caused by the force quit and the frezing happens again."
First things first; Mac 101, a program should not be crashing or crashing your machine.
Macs are really simple, but sometimes the intro of some software or migrated files can make for wonky, you need to resolve the crashing before any further steps.
Do you know how to verify and perform a repair permissions on your Mac? A visit to Apple.com > Support > keyword search "Disk Utility" will walk you thought this, important to know, Mac function.
In brief, restart your machine, after you hear the chime, hold down command and R until it the Apple appears, then select Disk Utility.
Before performing a permissions repair, sign off of FTMM2 and quit it
You could also have a corrupt file, the size is not the issue. What program created this file you migrated/imported to FTMM2?