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All right I can help you..
Firstly You got DDR2 RAM compatible motherboard. So Go to your Motherboard Vendor site and Get the Information About the which RAM you need .. that is for example PC2100 @ 133 MHz etc etc... and get 1 GB DDR2 ram Believe me it will be dammet useful for you in the future . And Secondly to play A3 without and touble u need a cool Graphic card.. Get an Nvidia ghraphic card. IF you are haivng the Graphic card installed Get its approprate Driver's or no Point of it being there in the system.(Coz you told when u hunt in Maps your pc get hanged)
Secondly. Even after doing this your PC is getting Hanged. then Format the whole HARDDISK including C:\, D:\ E:\ , .... May be due to any virus .. or Any other falt in the Harddisk .. So formatting the Harddisk 'll fck the virus Up

or any other Issue . There is no point in Formatting the C:\ Drive again and again .. Be sure That you Delete the whole of the Partitions . Or else it will gain be the same
And please dont keep Formatting the Harddisk again and again it will cause your Harkdisk to become Weak .And dude Get a Latest Antivirus .. and keep it updated with the latest definition's. And also Check to it that you have installed A3 client properly..
Even if the problem Exists then.... We will see..