Purpose of directories

[steve]

I am well versed in windows, althought I noticed that some
directories such as:

\windows\installer
\windows\cache
\windows\downloaded installations

have files in them that have already been installed, is
there a reason why these files must remain in these
directories? It seems to be taking room up on my HD, can I
delete these? there are sudirectories also but look to be
part of registry keys or pointers.

I have created same name directories off of the root and
cut and past them into these and it has no ill affect on
the system.

Thanks for any help, please no guessing I can do that on
my own.

 

[steve]

I found out what the purpose of the installer directory is.