Typically, a smart thing to do with Photoshop in any version is to leave the default filters in Photoshop's folder (i.e. where they are when you install), and put the third party filters in a different folder located somewhere else on the computer. Preferably a place where they'll be out of the way, but easy enough to find should you need to. This is what I do with my filters, and my version of KPT 3, 5, 6 & 7 all work just fine with PS7. You may need to remove KPT7 and reinstall to the new location you select. Another thing to consider is that some filters (I don't think KPT7 does this, but Corel does some goofy stuff these days), require the bonding to the particular copy of the program installed on your computer. If you've installed filters like this (Flaming Pear, Eye Candy, Panopticum...all good examples) then upgraded Photoshop, you need to give Photoshop 7 your old program's serial number. It's in the same place with the Plug-In's and Scratch Disks with the preferences, and it's called Legacy serial number. It's the serial number of your old version to wich all your third party filters were bonded so they think you still have the same program and continue to function like good little filters. At least one of these two solutions should work. If not, I'd be giving Corel tech support a shout, or even Customer service as you may have a defunct copy of the disks.