I have some questions to be asked to all your computer doods.

1) I'm looking to buy a new GPU, right now I have a Radeon HD 7450 and its just not giving me what I need. The only catch is I don't have a lot of money to throw around to get a new power supply with it (let us say a budget of $150ish). Would a GTX 750 ti sc be worth it? I don't need to run my games at max settings, medium settings with 30 fps is fine.

2) Would it be worth it to buy a SSD to run my os off of? I have been looking into buying one for a while now, but I was never sure if the benefits where that high.

3) Do you know of any acceptable free anti-virus software? I had the windows defender, but windows 8.1 decided it did not like it anymore, and killed it.

4)How do you guys think I could get further into the knowledge of computer parts and builds? It is something that has always interested me, but I'm not exactly sure where to start. I want to build a pc, but I don't want to dive into it with what little knowledge I have.

5) Would it be worth getting windows 10 now, just to get out of windows 8 hell?