Typically yes if you wire it directly into the router and your PC has a RJ45/8 pin network card/port, not a 4 or 6 pin phone/modem port. Even wireless should be ok if you have the right wireless adapter for your PC.
Rather no than yes. It will work if the router is configured to work in the "G" mode.
Yes, it will. It will work with A, B, G, and N standards.
If your router is configured to work in G mode only, then the answer is yes. If the router is configured to use mixed mode (B and G), then the answer is no. N type adapters will perform as they are supposed too (if the router is configured properly).
It's not about computer, it's about which wireless adapter you are going to use. If you want take advantage of Wireless-N, you have to have a wireless adapter N.
You can't and you don't want to. A "N" router will work with "G" network components and will additionally support "N" hardware at a higher speed. Converting it to "G" would be a step down.
It should be, just make sure that your router is configured to work with both G as well as N networks.
Yes, you can. You have to configure your router to work in compatibility for G networks.
G repeater will not work with N network, unless your router is configured to work in compatibility mode. It means that your router can work with both G and N networks. Thus when you connect your G repeater it will extend only your G network.
Yes.
If you are currently using G then step up to N and also make sure to buy a wireless N receiver for your computer or the router is useless. If you are currently using G then step up to N and also make sure to buy a wireless N receiver for your computer or the router is useless.
Yes it is backwards compatible
You can get a good wireless n router at places like future shop and best buy that sell computer equipment and these kinds of routers. its also a good bet to try eBay