You possibily have this version (Windows XP SP2 Release Candidate 2) of the XP update, which could explain some things. If anyone thinks they have this version of SP2, some input would be appreciated.

I'm assuming this RC2 version is what accounts for the difference in MSCTF.DLL, the file I believe is the main problem. Unless somebody has version 5.1.2600.2575 of MSCTF.DLL (as opposed to version 5.1.2600.2180 on the XP computer I was using) and can run JJ2, it would appear your version has to be downgraded for JJ2 to work. Either you can try uninstalling your version of SP2 and download the currently available one on the Microsoft (simple, but could take a while), or you could replace your MSCTF.DLL version with this one (more complicated, but could save time).