Autocad 2011 all work lost.

Dear Experts,
In our company, recently few days back all the uses complaining one by one that whatever they work and save in the file, the work is lost next time they open the file.Below is what user mentioned in the mail. Please help if there is any patch need to rectify this problem.
Regards.

Dear Sir,

I worked on very important project yesterday, but I have to make that project 4 times.
Because after 15 min my drawing completely gone, I have to redraw from beginning.
Please fix this issue as soon as possible.
LVL 12
ibu1Asked:
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ibu1Connect With a Mentor Author Commented:
Hi Experts,
I finally find out the solution myself. It was the virtual memory setting in windows 7. I increased the virtual memory and now seems everything OK.
Thanks.
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Raheman M. AbdulSenior Infrastructure Support Analyst & Systems DeveloperCommented:
Check the autosave settings for the location and you may find anything over there.
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ibu1Author Commented:
Hello Raheman,
That is OK, but what is the reason behind missing the whole drawing.
Thanks.
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Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
Have you changed the AutoCAD default file save location?
Do you have the Set System Variable: REMEMBERFOLDERS to 0?
Curious if the Startup folder is different from where the project is actually getting saved.
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ibu1Author Commented:
Hi Lee,
We have not changed anything from the above.
Thanks for the reply.
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ibu1Author Commented:
I found solution myself.
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