Just a heads-up--and if I'm overstating the obvious I apologize--As most of have read thus far, and as ACES recommends, SP1 should be done over a clean install of FSX (recommended option). I recently uninstalled FSX and have FS9 running as well. Though most agree uninstalling FSX won't impact FS9, it does do some furniture banging in the registry department and caused a few of my FS9 .wav files and not sure what else so far to go missing in action.As a fix, I rebooted the system and ran a payware registry healer--over 53 files/.dlls "issues" were identified as problems (my previous counter would be 7 or 8).Also recommend defrag to "realign" bits and pieces after uninstalling around 14GB worth of FSX.KemoF15

I uninstalled FSX also, mainly because of a re-activation problem, andin my case Active camera worked only in Demo mode, had to request a new key.Helmut

Why not just rename the FS9 folder or move it (also rename/move the registry file/s)?I don't see how messing with FSX could do anything at all to FS9 if you did this.It's worth a go. Uninistalling and re-installing FS9 would be about a 6 hour process for me. lol