Security Software

I have officially given up on it!
First, I had AVG free installed on my laptop which was great, no problems what so ever.
Also had Norton (free trial) on the desktop computer (all microsoft comps seem to come with it now). But this is a very sneaky deal Norton and Microsoft have got together...
as I discovered from a friend, you cannot delete Norton. Even if you uninstall it, it still runs in the background of your computer! I found Norton files still stored on the system, and if you go to delete them, it warns you that deleting them may bugger up your computer...oh...great.

So, I did not know this before my dad decided to purchase McAffee. Seemed to be fine at first but we soon discovered, it blocked firefox. I checked it wasn't the firewall, nope firefox had full access. Couldn't get onto IE either. Hmm...oh and the laptop wasn't working either, everytime you turned it on it crashed and restarted itself. I really thought it was truelly buggered. I had removed AVG on it and put on McAffee before this had started and this must have been the problem because when McAffee had been removed. It stopped crashing and it's now working fine!
It was the same story with the desktop, removed McAffee, we could now get onto firefox. Wtf?!
It seems Norton was interfering with McAffee but why was my laptop crashing? I still don't know till this day...stupid conflicting software...