I always get this problem whenever i start to mine, been trying different pools but i still get the same error can anybody tell me how to fix this.
I dont know what "OpenCL error" this is my first time mining.

Just reduce the clock frequency of GPU0
Well im really new to mining and doing program and stuff,so can you tell me how should i do it since i dont know what is the frequency of GPU0 and how to reduce it because im afraid if i did something wrong it might ruine my PC.
I would really appreciate any help to mine bitcoingold.
Use MSI Afterburner to change the card(s) core/memory frequency.
Some more information on your setup would help us fault find the problem, such as what type, and how many, cards you are using, which OS, etc.
EDIT: Just noticed your card has 887MB of memory, it does not have enough vRAM it will never work. Is it a laptop you are doing this on as it looks like you have an HD7520G video card (or similar) ?