Flash CS5 is very very unstable.It sucks ! Don't install it !
I certainly feel for you.
I would advice you to always keep a backup of your work.
As for the stability of CS5, I have not experienced any of your
problems. I haven't had a single crash or corrupted files and everything has been
working flawlessly since installation. (I might be a lucky sob?? ).
The only system crash (system lockups) I've experienced were due to:
A: Some obscure internet app installed without consent. (IExplorer related)...
B: Driver related problem...(Game security issues or obsolete software drivers).
My advice to you is:
1. Keep you machine as clea as possible..
2. Divide your harddrive into at least two partitions.
One for the operating system and standard software and
one for your data . If your C drive goes fubar, it won't hurt
your data section, even if you have to reformat and reinstall.
3. Keep your drivers up to date.
4. Don't install anything you won't miss.
If your machine goes fubar, then try to do a system restore. It won't
restore your corrupt code, though. Corrupt is corrupt...Nothing to do
about that, I'm sorry to say.
I can't stress it enough...ALWAYS keep a backup of your work. I always
keep several versions of every project I've done. It doesn't take much
time to copy your work into a different location/folder or burn your work onto a CD/DVD.
Anyway: I sincerely hope you solve your problem
Best of luck