Talk Blogging

my computer cannot open zip and tar.gz files

Not exactly sure what you mean by "blog software", but a .exe file extension is an executable, it is a program that will run on your computer. Be very careful when you click on these, they could be viruses or trojan horses and may cause damage to your computer - make sure you trust the source.

As for opening .zip, .tar, .gz, .rar, etc., these are all archive files. They are basically a collection of files that have been compressed to save space. You can download one of many free programs to open these, my favorite is winrar. http://www.rarsoft.com/ Just install and double click the file to open, but again, be careful what you click on!