I thought NMM was going to be a great mod manager for Fallout 3, so I downloaded, and when I went to install it my antivirus said this program could to extremely harmful things to my computer. I quickly disregarded this warning because I completely trusted Nexus with my computer's safety. When I installed my computer crashed. I then had to run Windows in safe mode then uninstall NMM, before I could use my computer again; I think Nexus is a safe site, but as far as NMM goes, I'm not using it again untill they take it out of Beta. I mean really? It could of destroyed some extremely important files on accident.