Lightroom 6 keeps crashing directly after starting up

Hi, I've got Lightroom version 6 (stand alone programm). Since a couple of months I opened the programm again but it crashed after a couple of tasks. And with crashing I mean the programm just shuts down out of the blue without a single (error) message. After starting the programm several times it seems to happen more often when deleting pictures from the database. I thought it might be a problem with my laptop. But now I started working on my desktop and the same problem occurs. Actually even worse. I could open it and started to import photos. It crashed during the import (as like the task was too heavy to execute...). And now the programm crashes as soon as I open it. Can't do anything anymore. 

I see some messages about windows updates but all these messages are well over a year old so no idea if this is the problem in my case. I did check on windows updates and found 2 which I installed.

Does anybody have any idea what might be the problem? Could the size of the library be a problem maybe? It's 225MB at the moment. 

Hope anybody can help me out. Bit of a disappointment because I had big plans for Lightroom these Christmas holidays.

thanks 

Tessa

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