Unreal Engine freezed after importing character

Hi,
recently I started to made game and I’m having problems with exporting fbx files, expecially riged character. In the beginning I didn’t have problems with exporting, everything was ok. For the last few days UE frezes completly after exporting, I cant even close the program with out turning of the computer.
I thought that’s because of kinda complicated model or maybe wrong riging (I’m still a beginer), but the same problem was with exporting other fbx files. My next thought was, maybe my hard drive is full, so I deleted all the temporary files, but it didn’t help.
I tried to solve this problem for few weeks now and watched all of the tutorials that I could find, but nothing works.
I think it could be weak computer( but it use to work so I don’t know?) or my lack of knowledge. As I said I’m still learning so maybe I did waight paint or riging wrong.
Maybe somebody had similar problems and some how solve them. Any advise will be helpfull:)

Thanks for reading