Looking for tech documentation solution

So I'm on the lookout for something, but I don't know how to briefly describe it. I want something to help me document various projects at work. It's not uncommon for me to spend a week setting something up, and it works for 2 years and then has a problem -- and I have to re-learn everything about it from the ground up before I can start solving it. For example, I'm setting up a new VMWare server today, and I just know I'm going to forget some of the details on it -- so I want to be able to type out some of the specs and processes, maybe use some tags, a coupel hyperlinks to more info, and be able to search for it a year from now. Does that make sense? Anybody have any suggestions?