1. If the machine was password protected and you don't have the password, just pull out the hard drive and put it in another machine that is running Windows 2000 or Windows XP. You will need that operating system because the File System will be NTFS and can only be read on those OSs.
Set the drive jumpers as a 'Slave' drive and install. When you turn the machine on, it will appear as 'D:/' (or the next logical drive). You will be able to access any files on the disk (I am assuming this user was not smart enough to encrypt the files, if so, I can post those instructions also).
2. Look up a book called "Red Hat Linux 9" published by Sams Publishing, Authors "Ball, Duff". Get a book called "A Practical Guide to SOLARIS" by "Mark G. Sobell". Those two are great places to start.
You can also look up the "Craig Hunt Linux Library". It is around 7 books covering everything you will need to configure Linux machines, including Samba, Apache 1. x, and many other topics. If you are interested in creating a web server, you should look into deploying with Apache 2. 0 (I have not bought a book on it yet; but, in theory, it will run on a Windows machine, I have it running on Solaris)
I will warn you, I have been doing System Administration/Network Engineering for a very long time (Have both a BS and MS in Information Sciences and Professional Certifications), and if you want to do simple administration, I would strongly suggest going with a Windows Active Directory based solution if you are running a small network and want to do simple file sharing and policy administration (Just a note, Small Network for Active Directory in Native Mode will support just over 2,000,000 users).
There is much more information out there with regard to installing and administrating Windows products (I am not boosting anybody, I use a corpus of OSs and I am just giving my $0. 02, Microsoft just maintains around 95% of the global OS share).
You will need to set up Samba if you want to share files from a Linux machine to a Windows machine. There are other options out there, but they cost money, Samba is free. Of course this is assuming that you want users to see these files as shares. You could just have users SSH into the machine using some secure client and transfer files that way.
-Rich