turnonmyheels | Technologically Impaired. But learning?

I've acquired a copy Windows 7. It took 3 discs to burn but when I installed, it only ever prompted me to put the first one in the drive. Everything appears to be running a-ok. Should I go ahead and put the next disc in?

Leave well enough alone? There are three discs for a reason? Curiosity killed the cat?

Visually, I think things look much sharper. Speed-wise things appear to be *much* faster. Yay!

It appears that I haven't lost anything data-wise either. Everything was moved to a folder called Windows.old and is easily accessed.

My next string of questions begins with this: what free [if any] antivirus, spyware, trojan etc. programs do you recommend? I was using Kaspersky with the old OS because I had a copy of it from work. I went ahead and downloaded AVG Free yesterday but I do not know if that is enough on its own

Presuming my work copy of Office 2007 won't load [I think all the licenses are used] would it be safe to go into the Windows.old folder and use the existing copy? Should I copy it from Windows.old and put it on 7? Or is there somewhere safe I could acquire Word and Excel and not have all those other programs? I don't use them at home so I don't need them eating up space on my laptop.

I'm sure this is only the tip of the iceburg as far as questions go. Y'all are all probably going to hate me within a week.

Any advice/help will be greatly appreciated!

eta

If I was going to immerse myself in Fringe should I go back and watch all of season 1 or could I skip to season 2? I watched the front half of 1 and odd episodes here and there. Please advise.