I use 4D Extra from Viking and it works great with Windows 7. I just had to download the update.
I use Buzzxplore. From buzztools.com. Excellent for viewing and sorting files
You might still be able to run PCAT95 on your win7 computer if you right click PCAT95 and choose to run in XP mode ..or it may be right click and choose compatiblity .. I forget lol I only use win7 occasionally but the option to run older software is there..UNLESS you have 64bit win7, then you might be outta luck with PCAT95.
It seems that forums and groups are abuzzzzz with the new embrilliance software so that's another option other than those already suggested, if you cant get PCAT95 to run for you. :) xXx
I just got SewIconz and love it. Tiny little pictures of the designs in the folders. Join their yahoo group-SewWhatEmbroiderySoftware-the creator of the programs-Steve, is right there to help everyone. I had a problem with jef showing, and he personally called me and walked me through fixing that on my computer. They also have other programs for cataloging, editing, all the usual stuff we need to do for a good price.
Jo