Just out of curiousity, is there any specific reason why you want to stick with 5? Are you at least trying to use 5.5 SP2? If not, you should. Even IE 5.5 SP2 has been a huge step up from 5.01 SP3. Before, in IE 5.01 (even in SP3), continuous problems arose with many of it's drivers, especially pdm.dll and mshtmled.dll.
Most of these issues like cookie exposure to applications and memory leaks, they didn't even fix until IE 6.0 SP1.
Just a thought....