A bit excessive, shouldn't have needed to do that. Anyway since you have done it can I just suggest a few things.
Get Avast Anti Virus or AVG, it is free and better than Norton as it updates more regularly.
Get Spybot Search and Destroy another free program that is great for maintaining your registry as well as blocking spy ware
Firefox is a great browser and you can customise it until your heart is content but a few add-ons you should download for it would be No Scripts, Ad Blocker and IE Tab.
Windows Defender is another must, make sure you have it on all the time.
Don't go for any software you pay for like Norton or McAfee as they may look and sound good but they aren't you end up having yearly subscriptions and sometimes they won't pick something up as where with Avast or AVG you get them for free and they pick up 99% of dangerous files.
I have used Avast for a good few years and never had a virus but before that I used Norton and in that time got a few and Norton done nothing about it I had to down load other programs to get rid of the virus.