It is very common to forget to save your files on your Office 2007 and the next day you find your computer closed:
Office 2007 have a great option that allows you to Autosave and Recover your unsaved files:
The default path is - C:\Documents and Settings\
UserName\Application Data\Microsoft\
Application(excel,word, etc.)It is usually set up as default but just in case here is a user guide from MS of how to set it up -
http://office.microsoft.com/en-us/help/HP101407291033.aspxThe next time you enter to your application it will show you all the files that were opened and not saved on the left side.
Now here is the beautiful part of this guide... What happened if you were too lazy and didn't look at the recovered files and close them again without looking?
They are automatically send to the recycle bin!!!That means that you will have any file that was auto saved in the recycle bin, just press right click on the file and then restore. You will be able to find the file in the directory mentioned above.