There are many helpful threads if you care to look in
this section
This thread offers suggestions to get 5040 running when it won't work, as well as
this thread which helps out if you're on Vista (prob same issues on Windows 7)
If you look at
this thread; he states he can't get any driver more current than 181.71 to work.
Make sure you've got the latest
beta PD-SE shown in
this thread and then keep trying all the fixes in the Tech Support section.
Remember Windows 7 isn't even officially supported yet, so you should expect problems.