See here for an idea of the 2nd User market price of this computer and its RAM Memory Modules:http://www.ebay.com/sch/i.html?_kw=PRESARIO&_kw=SR1475CL&_dmpt=Desktop_PCs
This specification of your brother's computer may seem okay for offline, single function-at-a-time computing functions, but will almost certainly be unbearably slow browsing on the internet, opening busy webpages, accessing the internet at peak times, downloading data and updates, multi-tasking and on functions like video streaaming.
No disrespect at all to him, but even at the time your brother brought this computer in 2006, there was better, faster Dual Core CPU and DDR2 RAM technology emerging and widely available.
You would almost certainly need to upgrade the RAM by removing the 512Mb stick installed (and then discarding it - almost nobody needs 512Mb RAM sticks now) and replacing it with 2 x 1Gb sticks.
Because 1Gb DDR RAM Memory Modules are a scarce commodity, no longer in production, much sought after by users with old, slow computers and highly prized and treasured by those who have managed to get their hands on some, there is a rapidly dwindling pool of supply and the price is relatively high.
When you add the cost of the computer and the RAM, you would probably be better off using the same money to buy a faster, more powerful, more up-to-date notebook, netbook, nettop or even a slightly more up-to-date, used Desktop that takes DDR2 RAM rather than the older, slower DDR RAM of your brother's computer.
The best outcome for both of you, would be for your brother to get the highest price he can for his computer from eBay or some similar site and for you to browse Amazon Market Place for the best, most up-to-date computer you can afford.www.amazon.com
> Amazon Market Place features reputable, trusted suppliers trading warrantied products under Amazon's oversight. Pay with a major credit card for further protection from your card issuer.
I hope this helps