As much as possible refrain from DELETING any files, most importantly the *.EXE files as these are executable files to run the programs in your computer. If you are not sure, don't delete anything. Be sure to read everything if there is a warning screen that pops up. Most of the time, there are just onscreen instructions on what you need to do next, so just follow them.
If you're using Microsoft Windows, you will notice that there are a number of short cut commands which are generic that you can use with most of the programs that run with Windows (i.e. ctrl+c is copy , ctrl+v for paste..)