NAV09 and browser crashes and tmp files

Since installing NAV09 on an XP SP3 with IE8, some websites (ie. myspace and a currency conversion site plus a few seemingly random others) will cause IE8 to crash. If I disable NAV09, no problem. Any insight into what's causing the issue?

 

Also, since the NAV09 install, I'm getting .tmp files of Excel and Word documents that don't disappear when the file is saved and closed and can't be deleted until the computer is cycled off/on.

 

Help?

 

And thanks in advance!