Flash 'Unexpected File Format' Save corruption

Hello.
We recently upgraded to Windows 7 64Bit from Windows XP here at work, and since the upgrade i've discovered a very scary issue with Flash.
When going to save one of my large projects, often Adobe simply crashes outright, freezing up and displaying a standard error message.
"Adobe Flash CS5 has stopped working. A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available." - with an option for "Close program"
I hit close program, and Flash disappears. If I try and open that same FLA file again, I get the error message
"Unexpected File Format"
Unfortunately it seems since Flash is crashing in the middle of saving, it is corrupting my FLA file. This is extremely worrying, since it corrupts my entire source file.
I'm lucky I keep regular backups, otherwise I could have lost months of work instead of just todays. In the meantime I have been copying and pasting a new version of the file each time I open Flash, but it's a crapshoot whether next time I save if it will kill it or not.
Here's the details of my computer:
OS: Windows 7 - Recently upgraded from 32bit Windows XP
64 Bit Intel Xeon X5560 @ 2.80 Ghz
4GB Ram
The Flash CS5 version is 11.0.0.485
The FLA in question is 10MB, and contains some large map files (gifs), lots of small JPG's as well as a fair chunk of code as well as importing of external classes. I've tried replicating the issue on smaller files, and haven't been able to do so.
I was wondering if it was a case of not enough memory, but Flash appears to use around 450 mbs. About 40% of my total memory is free, according to the Task Manager performance.
Any ideas what could fix this issue?

Hello Sukhi12,
I just read your reply and I can't believe that Adobe is taking a stand like this!
Are you seriously (no really, SERIOUSLY?!?) telling us that Flash is not designed to save files over a network?!?!?
I am really upset by the fact that Flash is such a badly designed product and I'm even more upset by the fact that appearently Adobe doesn't give a ***** about it!
Are you aware that in the modern world EVERY company has a policy to save files over a network? For most developers it's not a choice of saving locally, it's just not an option. We are forced to use networkdrives, and if I may say so, I totally agree we should! Come on Adobe, this is 2011 you know! And saying in your technote (from 2009!) that we just have to use a third-party version control system is totally rediculous!
A few things that I like to say about this matter:
1) I have been using Flash for about 10 years now. I have been using a network drive most of this time and I never (really, never!) experienced corrupt files while saving. Even with flash 5 there was no problem at all! So something changed with Flash CS5 and Flash CS5.5 and Adobe is too lazy to admit it. Very bad....
2) Why is it that software like Photoshop is able to save over a network without any problems? Why is a PSD-file so much different from a FLA-file? Surely Adobe must have people on the payroll that are perfectly able to code software that can save over a network? Photoshop proves it's possible, doesn't it?
3) I told you in the beginning of this forumpost that I'm saving my files over a network. Why didn't you show us the technote at that point? Why did you ask me to send you sourcefiles first? Is there some boss that told you to get rid of those nasty questions, or something?
4) I'm really surprised that the technote says that Flash IDE is not "designed" to function across LANs. Why is this not mentioned on the Flash Product Page where you want us to pay $699 for this product? I would really like to know this as a new customer! Something in the features like: "Beware, unlike other software, Flash Professional is NOT ABLE to save your files across LANs. If you try to save, flash will most definately corrupt your files beyond repair".
5) As you can see, I am really upset about this and especially about the attitude Adobe is displaying about this. I'm am surely going to twitter this to everyone I know and start a good amount of posts in the Flash Community about this.You really can't do this, Adobe.
You might not suspect this, but I am actually a big fan of Flash, as I suspect most of you are. I like to think that I support Flash despite the fact that Apple is pissing all over it lately. I defend it to people by saying it's a wonderfull product that does wonderfull things. I am very dissapointed that Adobe is letting us down like this.
Please answer these question for us. I'm sure the Flashcommunity is dying to know what's going on here!
And also, please ask your developers to fix this annoying problem. I'm sure it's not impossible....
Regards,
Sander

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I was working on a project and hit save when Flash freezes and I receive an error message saying "Adobe Flash CS5 has stopped working. A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available." - with an option for "Close program"
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