Flash CS4 can't open .fla files or lose files/graphics

Question

     I installed Flash CS4 Professional trial version for school use.  It wouldn't install successfully.  I deleted the font files the troubleshooting guide said to, tried again, but gave up. (I'm afraid to run regedit and mess up everything else I have loaded.)  (I previously had the Fireworks CS4 trial version loaded, then uninstalled it.)  My problem is this- I have it running, but it saves files and then they can't be opened, even if I use the save function often- it's worse when I create the file, test the movie and then save.  If I try to open it again, it says "cannot open file."  Once it opened a copy I had saved, and it appeared blank, even though it was 544 kb file size.  I only need it for a few more days, one more assignment and I'm afraid my previous files are corrupt.  I have Windows Vista Home Edition.  I'm tired of redoing files!  If CS4 is unstable like this, I don't want to buy it!  Fireworks didn't have good help menus like Flash does, but at least it ran well; or do I still have files that didn't uninstall from Fireworks causing trouble?  Anyone?
con calma

Answer 1

I tried it- no good.  When I reinstalled it, I got a fatal error 1603, with the color common set rgb uninstall color profiles rollback.  I deleted the color files again, and tried to run regedit, but the last item Adobe advises to do in troubleshooting I didn't see as an option in Regedit in my Vista, so I let it go.  I will uninstall and reinstall once more.  I ran checkdisk- ok, and malware remover, so no problem there.  Vista won't let me run backups, but I did export my regedit files, so here goes nothing- last resort; I can't open my Flash files or they're corrupt still.  I tried calling Adobe, but the phone doesn't recognize the number I punch in for which  support I need- the message keeps looping.
con calma