Slow computer. Virus?

I bought my ASUS Zenbook about a year and a half ago.
I was starting school, and needed a laptop to take notes.
When I first got my laptop, I was super excited to play around and discover Windows 8. (I've had Windows 7 forever on a desktop PC and Vista on my old laptop. I, like much of you, LOVE new technology.) I was immediately confused, and I actually hated it. I hated everything about Windows 8. I downloaded 2 pictures - one for my background, and one for my picture for my login.
That was it.
I didn't touch it for a few weeks and I didn't end up using it much as I planned. I found it was too much for me to bring to school, and that I personally prefer writing notes by hand.
I obviously updated my laptop to 8.1.
My computer was slow the next time I turned it on.
I downloaded Avast, and Ad-aware - they've always seemed to work for me.
I ran some tests, as I'm extremely paranoid.
In the mean time, I would go on Facebook or Songza, and maybe Youtube. That was it, newspaper websites too.
I didn't do much on my laptop. I kept turning on my laptop to find out what was going on why it was so slow. I was told it was going to be fast since it has an SSD drive in it. I was disappointed.
Later weird things kept happening, my computer always wants to update- fine whatever do your thing girl. Then it would turn on extremely slow. It would do everything SLOW. Writing my e-mail into facebook would take 5 minutes because the internet kept freezing. I would get messages from windows saying that things were turned off. I would finally have a decent going laptop able to actually get something done, when it would have a loading bar - for no longer than half a second - appear at the top left corner. It was for less than half a second - I couldn't read what it was saying.
I downloaded a bunch of things to scan my computer.
Avira, CCleaner, MalwareBytes, and BitDefender. I haven't been able to find anything recently, but I know before I was seeing a few things that were Internet add-ons that I couldnt delete, but dont appear anymore.
I've been told it could be an issue with the SSD drive, which is SanDisk 24gb.
(I believe)
I hope all this information helps....HELP me out please. anything helps.
Processor: Intel(R) Core(TM) i3-2367M CPU @ 1.40GHz, 1400 Mhz, 2 Core(s), 4 Logical Processor(s)

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