FRx is one of the flakiest pieces of software in the GP suite. Integration Manager often competes for this prize but FRx is still the repeat champ.
After installing GP without problems on Windows Vista Business, I'm stuck with an FRx installation that won't load. Yes SP9 (9 service packs!) is installed. In shame I finally slinked over to tech support. First step, uninstall FRx. It's more complicated than you think to really get rid of it so here are the steps. Next week, I'll explain how I finally got FRx running on Vista (hopefully!). Backup any existing Sysdata directories before you start please. I don't want to hear any whining!
To Uninstall FRx on XP or Vista:
1) Uninstall the app via Add/Remove Programs or Programs and Features
2) Delete the FRx installation directory
3) Delete/Rename the FRx.ini file in the Windows Directory
4) Delete the registry key HKEY_LOCAL_MACHINE | Software | FRx Software (Backup the registry first or roll the registry dice. It's your machine.)
5) Blow that screwed up install of FRx a big kiss goodbye before you do a reinstall.