Hi Abdulla
You definitely have a system memory problem , you need at least 8 GB
1. First of in Vray under option , system - Set your dynamic memory limit to at least 4mb
2. From personal experience I have noticed that a certain texture can cause light cash not to build , unfortunately this means taking them away one for one to see when light cache builds again
3. In sketchup , bottom left , click on model info , statistics and purge your model and fix any geometric problems , I have also noticed difficulty in scenes rendering if the model is "broken"
4. As for sketchup crashing under Vray options , output , render output - set a folder in which it saves as soon as it is done
Hopes this helps brother
Regards
