My computer is running on Windows XP, SP3 and I have loaded both FS 2004 and FSX. FS 2004 is loaded on my main hard drive ©, and FSX is loaded and running on an external drive (L). I have been using FS 2004 for several year without any problems. I installed FSX a couple of months ago, and until now, didn't notice any problems. For the first time since the FSX installation, I tried to use the PSS B777 program. The system loaded ok, but when I tried to configure the load for the aircraft, the utility was not appearing and I was unable with the following message: "Cannot locate MS FS 9.0. Unable to import configuration." or words to that effect, I don't recall the exact message right now. Then I found the FSTweak on this forum to address this, now I can configure the fuel and load, and open FS 9.0 with the correct aircraft, but when I try to program the FMC/CDU on the PERF page, the system freezes.

"Cannot locate MS FS 9.0. Unable to import configuration."

a simple reg-entry problem that can happen with an FSX install. easy to fix. use flight1's free 'FSX/FS9 Registry Repair Tool' available at -http://www.flight1.com/view.asp?page=library--

No luck...I tried the registry repair tool. The panel still freezes while programming the CDU. Any other suggestions? I appreciate the help.Thanks