Thankyou for your response... being new to this i have had a look and it says the following
This system can run the last version of OS X 10.8 "Mountain Lion" as well as the current version of OS X 10.9 "Mavericks," but does not support the AirDrop, AirPlay Mirroring, or Power Nap features. It is not supported booting into 64-bit mode when running Mac OS X 10.6 "Snow Leopard." It does support "OpenCL" and Grand Central Dispatch introduced with Mac OS X 10.6 "Snow Leopard."
Please note that OS X "Lion" 10.7 and subsequent versions of OS X, like Mountain Lion and Mavericks, are not capable of running Mac OS X apps originally written for the PowerPC processor as these operating systems do not support the "Rosetta" environment. To run PowerPC applications on this Mac, it will be necessary to use Mac OS X 10.6 "Snow Leopard" or earlier
what do i do next
Thankyou once again for your reply
Gaz