I'm not going to guarentee it will work, but most big computer companies have download centers to get drivers for pretty much every part they ever sell, just go through the lists to find your computer model, operating system, etc. I looked and I found an Orinoco driver, I'm not sure if it will work but it says it's the wireless one, so you can give that a shot here:
http://support.gateway.com/support/d...id=16 4365941
As for the battery issue, I'm not 100% on that either, but its odd that the second battery is only $20 compared to the $100 one, unless both are different sizes. It should work, but then again you might be able to ebay one of the more expensive ones.. It will probably work a lot better for portability either way.