I have a sitemap.xml module installed on my site, but it's only indexing 4 pages instead of entire site.

From what I've read, the file should be named sitemap.xml, but mine is named sitemapindex.xml. So I went into my admin panel/configuration/sitemap XML and I edited the name and changed it to sitemap - then i went to my webmaster tools, deleted the old name, and added the new name - http://bigredworkwear/sitemap.xml

When I link to this, I'm getting an XML Parsing Error: no element found - is this just because Google hasn't picked this up yet or are there other file names I need to change from siteindex.xml to site.xml?

Does anyone have any idea why Google is only picking up those four files instead of my entire site.

Thanks once again for helping me....