First of all, you should have run the windows 7 upgrade advisor either before or during the windows 7 installation.
http://www.microsoft....bd9-9e51-2497c146af15
This should have told you if there were any issues with your attached hardware such as printers etc along with software incompatibilities
I upgraded from Vista Home Premium to Windows Seven Ultimate and my HP printer was incompatible and failed to work on the installed drivers. It took me around four days to get it back up and running again due to beta drivers on the HP website that failed to work properly. I permanently lost Sibelius 5 music software as it won't work at all with Seven. Everything else was OK.
Having read the forums extensively before upgrading, the general opinion is that the upgrade advisor is excellent at picking up the stuff you're likely to lose so I doubt you'll find any issues with your installed programs in the near future.