Caution Never,

ever delete something just because you don’t know what it is! You
should delete only items you recognize and are sure you want to get rid of.
Otherwise, you might delete a file that’s important to the proper functioning of
Windows, which would make your computer perform erratically, or not at all!
Finally, if you’re in a program or dialog box, look to the upper-right corner of its window to see whether
there’s a button with a question mark on it. For example, the Date and Time Properties dialog box
shown in Figure 1-14 has one. (To open the dialog box, I double-clicked the current time in the lowerright
corner of the screen.)