What version of QuickBooks am I using?
What edition of QuickBooks am I using?
What update patch do I have installed?
How big is my data file?
How fragmented is it? (And thus, how potentially unstable is it?)
Where is my data file located?
Where is my license number information?
All these questions and more are easily found simply by pressing the F2 key when you are in QuickBooks with your company opened.
If you find yourself needing support, through QuickbooksUsers.com or otherwise, this will probably be information you are going to need.
The update patch is shown right after your version. In this screen shot, it shows R5P.
If your file size is large (250MB or more for Pro or Premier versions, 750MB or more for Enterprise) and your DB file fragments are high (20 or more), then your file is potentially more likely to get corrupted. You can get those numbers down with supercondensing or a company recreate.
One other nice number from the F2 screen: free memory. QuickBooks likes to have lots of elbow room.