Good specs?

Hey, I recently bought a new gaming PC, but I just seem to lag a lot. Could you please check out my specs, and tell me any issues I need to address? It's only a £400 (596 USD) so it's not that impressive. Thanks!

Processor: AMD A8-6600K APU with Radeon(tm) HD Graphics 3.90 GHz

RAM: 8.00 GB (7.20 GB usable) (side note, I only know it's an AMD, not which model)

Graphics Card: AMD Radeon HD 8570D

OS: Windows 7 Home Premium

Sorry, that's all I know of my PC, and also I do not know much about PC's so please try to dumb some things down for me. Thank you!
 
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