Can't Save As PDF in 7.2 after upgrade to 9.0

Question

Hello again, Framers,
In 7.2 we routinely used Save As PDF without problem. Now that we also have FM 9 on our systems, however, it appears that the newer Distiller overwrote the older one (the one that worked well with 7.2) because now when trying to Save As PDF (in FM 7.2), we often have problems. It all seems very random and we are at a loss as to understand.what is happening, why, or how to fix it. 
The symptom is a FrameMaker error saying "Can't launch Acrobat Distiller to create a PDF file."
Double-clicking acro.exe won't open Distiller -- nothing happens. (Can't open acrodist.exe or acrotray.exe under any circumstances.)
Printing to .ps and double-clicking the .ps file sometimes works, sometimes not.
Deleting the .tps files and others backups sometimes works, sometimes not.
Retrying Save As PDF multiple times sometimes works, sometimes not.
We three tech writers have similar setups: We're using XP, have all the latest FM patches, plenty of RAM, etc.
I hope the answer isn't "get rid of 7.2 and use only 9.0" -- our deadlines are such that it's hard to work only in the new version. The UI is different and some functionality is different, so the learning curve will take at least a bit of time.
Could it be as simple as having MIS re-install the 7.2 version of Distiller? Although we specifically requested they leave FrameMaker 7.2 when installing 9.0, we didn't think to mention Distiller, which was apparently overwritten.
If anyone has any experience with this issue, your advice is most welcome.
TIA,
Gay Alson

Answer 1

Thanks both Arnis and Mike --
Interesting suggestions from both of you.
Arnis, we're putting the cleanup utility on the back burner for the moment, since in our company, we can get in trouble using third-party software. However, it's good to know about this utility and we will use if it we have to. (Occcasionally we are forced to put our careers on the line for issues like this...)
Mike, we created a folder called "PDFSettings" in the 7.2 "fminit" folder and copied over the six joboptions files from 9.0.  Rebooted, rePDFed and voila, that worked. (Mind you, we can't say for sure that's what worked, because as I said in my original post, the simple act of rebooting "sometimes works, sometimes not...")
Eventually this problem will go away by itself because eventually we will get rid of 7.2 -- it's only deadline time-crunches that have made us reluctant to jump fully-clothed into 9.0...
I really appreciate the two of you taking your time to offer suggestions and help. I can't imagine life in the FrameMaker world without you!
Cheers,
Gay