So I am buying this inspiron from bestbuy and I was wondering if its a good pc for me to upgrade.All I really want in is a 5570 graphics card (and I have to get a power supply).Here it is  http://www.bestbuy.com/site/Dell+-+Inspiron+Desktop+/+Intel%26%23174%3B+Pentium%26%23174%3B+Processor+/+4GB+Memory+/+500GB+Hard+Drive/9846086.p?id=1218183110027&skuId=9846086 

You probally mean you want to get a HD5770 and no, that pc is sort of underpowered cpu and gpu wise. The only thing that it has going for it is 4 gigs of ram.

I dont want a monster pc all I want is something I can play  games like dragon age,mass effect and stuff like that.I dont need graphics tbh. 
 
And if even that doesnt work can someone please link me a PC which all I need is to change a couple of stuff?

All the links on this thread are broken, but Dell's are normally a real pain in the ass to upgrade.  The low end motels just don't have the spair power, case room or cooling to upgrade.  The high end models need specal parts that you can only get from Dell for lots of cash.
 
If you are ready for it, I would look at some of the bare bones cases at newegg,com and think about building a PC from scratch.  The bid things is to make sure you get a motherboard that will allow any future upgrades, and make sure you get a relable power supply!!!  Going cheap on the power supply was the worst mistake I ever made, as it fried my whole system!

yeah if you spent the time building your own, you could build a more powerful PC that is cheaper than retail made computers.