When programmers program they need tools. One set of these tools is
called the .Net Framework, which is used by .Net programmers. For the
program (programmed by these .Net programmers) to run, this framework is
needed: it needs to be installed on the pc where it needs to run. If
any software (software that needs the framework) feels like requiring
this framework, it installs it. Another possibility is Windows Update.
Windows Update installs the framework as Microsoft would like to see
this framework installed on all computers, so that it become a standard
and programmers do not have to worry so much. So just give us a break
and let it be installed
Hope this ridiculous simple explanation helps.
Michel van den Berg
ps: Perhaps "tool" is not the right word, as YOU can not use it, as it
does not have a user interface. It is more of a tool the program uses.