Question / Help Can only stream in Winodws 7 with Aero DISABLED

[funky4]

My pc specs:
GPU Geforce gt 620
CPU AMD fx(tm)-6300 six core 3.76 GHZ
16 GB RAM
I only play league of legends
I can only stream in Windows 7 with aero disabled. windows 8.1, ingame is too laggy to be playable. I would like to have aero enabled to get some window captures on my stream. I am guessing my GPU is the problem. What would be a cheap upgrade so i can stream with aero on?
thanks

 

[Joe33345]

How much are you willing to spend on a video card?

 

[funky4]

im not looking to go all out. I just need to have ingame not be laggy with frame drops. I can only get that right now with aero disabled. with graphic cards i dont understand what im looking at or for.