If you have similar Critical Errors as the one posted below, specifically about Insufficient Memory, please try out a tool named Large Address Aware, and apply it on l2.exe
Insufficient Memory. Please check the Virtual Memory Option and avilable hard drive space. You can check them by going to : Control Panel->System->Advanced->Performance->Settings->Advanced->Virtual memory.
It has worked great so far for us and some other users, it might work for you too, so check it out!
Special thanks go to @Berganize for finding out and sharing the knowledge!