Cheerio!

I was wondering how do you know wether you can trust the contents of a site and when not. For example I want to perform a registry scan from this site: http://www.liutilities.com/products/...r/dllfiles/rb/
because i'm getting delayloadfailurehook error all the time. But i'm not sure what it does so maybe it doens't do good at all.

Are there any specific things I have to pay attention for when trying to find out wether or not you can trust a site?

Thanks!