Both download files are called SRIM-2013.e, and are self-extracting ZIP files.
Put this file into a new directory called SRIM-2013, and rename the file to SRIM-2013.exe.
Execute this renamed file to extract all the SRIM files.
About 500+ files will be extracted.
If you have previously had SRIM on your PC, you should have no further problems. Find the file SRIM.exe in the root directory to start SRIM.
If your PC has NOT had SRIM on it before, then read _SRIM Setup Message in the SRIM root directory for setup instructions. Some standard Windows files may be missing from computers using Win-Vista or Win-7 systems, and this SETUP program installs them.
If you still have troubles, you can install SRIM-2008 which uses a different method of installing the missing Windows files. Put SRIM-2008 in a different directory, and then retry SRIM-2013.