Noob needs help - NIS2012

Sorry to noob up the board but I have just got NIS2012 without actually knowing what it does. It was on offer...

Anyway.

 

Will it remove existing viruses? I need to clean my laptop apparently.

I use it for uni work and spell checker stopped working in word 2007. I called the freephone MS help number. After 90 minutes the lady trying to help from iYogi said I had:

 

Scanning Junk files and folders

515 Problems Found

 

Scanning registry errors

325 Problems Found

 

Scanning fragments on disk drive

1.80% Fragmentation Found

 

Scanning internet and other privacy traces

275 traces detected

And that she could use specialist tools to clean it at a cost of £109 per year! At this point I thanked her and declined...

 

So yeah. I don't have a clue what any of that means. I see there is a clean up tool I can buy from Norton, do I need it now I has NIS2012?

 

Thanks in advance