Maximum PC

I recently built a new PC that I want to put into my room (second floor of my house), and I want to access the local network I've set up. The thing is, running a ethernet cable up there from the first floor would be very difficult, for a couple reasons not very important to list, so I'm trying to find other options. The DSL modem I'm using also can act as a wireless router, and I have another wireless router that works. Is it possible to connect two wireless routers to each other? I don't really know what kind of router the modem is, but the other router is a Belkin Advanced Wireless Router, model F6D4230-4.

If that won't work, do I need to get a wireless card for the PC? I'm afraid that if I do that, I'll get lag or unacceptably slow speeds on the internet or transferring files between computers.

Thanks!

From what I can see from a few minutes with Google, getting a wireless card for the 2nd floor PC is going to be your best bet. From what I've read, your Belkin router doesn't appear to support acting as a wireless bridge nor is it supported by any of the 3rd party firmwares that I checked.

So here's your options, starting with the simplest:
1. Just buy a wireless card for the PC.
2. Buy a wireless bridge or wireless router that can act as a bridge without modification.
3. Buy a pair of powerline Ethernet adapters.
4. Buy a wireless router that can be upgraded to a 3rd party firmware, upgrade to the 3rd party firmware and then configure it as a wireless bridge.

I'll go with that then, thanks!

Just grab a USB wireless N adapter. There should be no lag whatsoever between the two devices.