First off this is on Windows XP - P4 w/ 1 G ram.
I was using B3 fine and then removed it as required and installed B4.
It automatically imported (somehow?) the library I had in B3. I was browsing around and clicked on the last tab which is, I think, Web.
It froze the system and I had to shut down by using the power switch. When I rebooted and opened B4 again, it was at the exact place as before and froze the sys again.
So I uninstalled it. I went to Adobe and downloaded B4 again. I installed it again.
Guess what? Yep. When I opened the new download it was at the EXACT place were the previous copy was and FROZE AGAIN.