I've been switching back and forth between Access 2007 and Access 2010 with no problem as long as I open the database from Access. I right-clicked on a 2007 database in Explorer and selected 2007 but it came up as 2010. Today I right-clicked on a Word document and it opened up in Word 2010. Well, I didn't want 2010 so I closed Word 2010 and opened Word 2007 and I got a large installation popup, not one of those little ones, and I waited a while and it appeared to hang. I had to restart the computer. Access 2007 is still working fine but I'm afraid to open Word 2007. This will be a problem if I can't get Word 2007 back because I can't afford to buy the entire Office 2010.