I am new on here I've searched through forums similar to mine but it seems like my computer is just not anywhere to be found.

Dell 17r N7110
Processor: Intel i5-2410M @ 2.3Ghz (2nd Gen.)
Ram: 6GB Shared Dual Channel DDR3 Memory
Intel(R) HD Graphics 3000
HDD: 500gb
NVIDIA GeForce GT 525M
Motherboard: Wasn't too sure so I used CPU-Z it says:
Chipset: Intel, Sandy Bridge Rev. 09
Southbridge: Intel HM67 Rev. B3

Could anyone help me out or would it be possible to use my external 500gb seagate to install it on.