It means that the USP10.DLL is missing.This is most likely a common system file which should normally be on your system already. PAF must need this in order to run the program. Click on Start/Find.Search your local hard drives for a file named USP10.DLL.You should have one in a Windows/System or Windows/System32 folder.
If you already have one on your system, contact PAF support.
If not, recommend you see if you can obtain this file. A search of the internet brings up the following link which should be helpful.