Nightmare Windows network and licensing

Ok...the last time I managed a Windows network was in late 1990s with NT 4.0. I been in web development since that time. Anyhow, I wanted to take on some extra work, and a friend of mine works at a company where their network administrator had died. Long story short - there is about 60 PCs all on a peer to peer workgroup. Each PC has like 5-10 user accounts on it. All PCs are islands of data. It's a mess to say the least. Anyhow....the problem I am having is licensing issues. No one knows where any software licensing documentation is, and I having to search for CDs and serial keys whenever I need to reinstall any software. It's a nightmare. Anyhow, is there any software out there that I can run that can take a snapshot of any running software and product keys on each computer connected to the network so I can document this information? Thanks TJ