Old topic but I just had this problem again. Windows 7 did 7 updates on this past Monday and the next morning when I went to use WL it crashed on startup. Both WL 9.0.35 32 bit and 64 bit. I trashed the preference folder and everything is back to normal. I have been using WL pretty heavily as of late doing a lot of work on long live concerts for a client and WL has been flawless. Just wanted to let others know about a potential problem.