It looks like download.com is now wrapping all their downloads with a "CNet Installer" that you get when you click on the big green Download Now button. The filename it gives you is something weird like cbsidlm-tr1_8-Belarc_Advisor-ORG2-10007177.exe so you can tell they've wrapped the Belarc installer in their download manager. However, you can instead click the small-ish "Direct Download Link" under that button to get the AdvisorInstaller.exe that's only the Belarc created installer. It's digitally signed by Belarc so your browser will usually show you that it's from Belarc. You can also always get the AdvisorInstaller.exe on the authoritative download page at
Kudos to Mele for the warning!