GUI Miner-scrypt alpha [Lagging]

[eXceptional]

I'm New To Mining & I Heard That Mining Is The Easiest Way To Earn Online.
I Tried Myself By Mining LTC & BTC.

For BTC I'm Using Normal GUI Miner.
But When I Configure For -scrypt alpha And Start Mining My PC Starts To Lag Alot.

http://gpuz.techpowerup.com/14/02/01/34q.png

I Also Noticed That On The GPU Defaults List There Is No AMD 7700 :-?

Now Could Someone Help Me With This. Please Use Basic English Language To Explain Instead Using Technical Hardware Language. I Don't Have Much Knowledge On This.