Should I upgrade my CPU or my GPU?

With 100$ u cant upgrade gpu or mobo,cpu

Hd 7850 might be interesting for you

No cpu or motherboard for that price.

Get an hd 7770 for $100. It will be a good upgrade for you.

Well, I think I didn't state that I don't require a high end GPU/CPU, it can be dual core/quad.

Ah, okay, thanks for the suggestion!

No problem!

I just bought an Athlon II 640 quad core for $60 at TigerDirect. (I'm building a PC for my father-in-law) I expect to get a micro ATX board for $40 or less in the near future.

It looks like this would be an upgrade from your current CPU:

http://www.anandtech.com/bench/Product/63?vs=188

However the value of such an up grade will depend largely on what you intend to do with the computer.

Not worth it at all for barely an increase.

Get a 7770 for sure.

Wouldn't a quad core make games run faster because of the extra cores?

Not necessarily. Your GPU is the thing holding you back. Get an hd 7770. Games are like 90% GPU and 10% CPU.

Most games still only use 2 cores.

Ohhhh, many thanks for the suggestions and information  

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Around 100-110$
I tested the hd 7770 and now i have also a gts 250 from my friend....
Well, the performance isnt so different...

Ah, well that doesn't justify me buying it anymore   how about a non-ti Geforce GTX 650?

Hd 7770 is better than gtx 650

Hd7770
I would personally wait until you have your money to spend. It will be worth the wait in the end

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
You will feel a big boost with this card...

Hmmm, well I'd have to buy a new power supply cause the one I have now is actually pretty aged, so 189.99 plus the price of maybe the corsair which is about 43.99, also I don't currently have a "job" per-se (15 years old) so it would take some time, but I completely understand that if I waited and just saved all my money up I can get that or maybe an 8000 series (If it were released when I get said money). I really only have around $80 so I was just going to get a low powered video card.

170$ after rebate  
But ye, better wait for some more money

Or buy a used gpu...