As soon as you delete a worthless file, you'll need it.
Installing a new program will always mess up at least one old one.
You can't win them all, but you sure can lose them all.
The likelihood of a hard disk crash is in direct proportion to the value of the material that hasn't been backed up.
There are only two kinds of computer users: Those whose hard disks have crashed, and those whose hard disks haven't crashed - yet.
Anything can be made to work if you fiddle with it. If you fiddle with something long enough, you'll break it.