I have a HP KZ854AV-ABA m9300t 4g Ram 300g HDD with@150g in use Win 7 Home Premium 64-bit SP1 AMD Radeon HD 6450 -and I would like to see if I can increase the ram. I am unsure if it is one stick, or if it can use more. May I get some help on this. Yes, I could open it up, but my hands don't...