Almost happy

I recently purchased a DS computer and it has not gone the way I have really wanted it to go. Spending over 4K on a comp and having issues like this annoys me when programs and the machine do not work as I had hope for. First off, I got the Nvidia 590, cause I only play WoW and wanted it to run MAX on everything. iTunes and the other programs ran fine. The first couple of weeks, all went fine. Then the driver kept crashing. I finally had to take it in to get it looked at and to find out the RAM that was installed was faulty. I got that replaced and WoW ran great again. Then I started to notice other things go wrong. iTunes would not load or I could not gain access to the iTunes store (I can play WoW online, mind you). The the video driver started to crash, but not everyday like last time. I have emailed the person who has helped me last time, but this is starting to be a dissapointment right now. I live about 40 miles away, but lugging this machine is also a daunting task. I'm not sure what to do next, but call and see what I can do again. I was hoping to get a machine that I pick up and call back when I wanted to order a laptop. Everyone seems to love their maching, but i'm not feeling the same way right now.