n0ak, I don't get how people like you come to be the way you are. Did you try looking on your own? Did you read everything and then even once think "maybe I should try fiddling around with this myself" before coming here for help, twice in a row? And finally, did you think about the way your commets will be perceived by the others on this forum, or about how much easier it would be to help you if you were more detailed about what you tried?

But, lucky for you, I am one of those people who tries to figure stuf out on my own and happen to have a Vista laptop. So here's a very detailed breakdown of how to get USB internet to the N900. Some of these steps you probably already did so they might not need to happen again.

- Installation (Can skip steps if you already did them) -

+ Install rootsh on your N900.
+ Install Mad Developer on your N900.
+ Install Nokia PC Connectivity Suite of whatever it's called on your computer.
(I installed MADDE on my computer. I don't think it's necessary, though.)

- Needs to be done every time -

+ Open Network and Sharing Center on you computer. (I'm assuming you know how)
+ Click "Manage network connections" - it should be on the left side of the Network and Sharing Center.
+ Make sure that none of them have the word "Shared" in the status. If one does, right click on it, and press Properties. Vista will pop up its security warning ("Windows needs your permission to continue") - click Continue. Go into the sharing tab and UNcheck the top checkbox "Allow other network users to connect through this computer's internet connection". Press ok. (Even if this is the connection you'll be enabling sharing on later. Sharing has to be off for now.)
+ Now go into the properties of whichever connection (in the Network Connections window, not the Network and Sharing Center) is the connection getting internet. As in, the connection your computer actually gets internet from.
+ In the networking tab, click "Internet Protocol Version 4 (TCP/IPv4)"
+ Click the Properties button.
+ Select "Obtain an IP Address Automatically" and "Obtain DNS server address automatically". (It may be already set to do that. Mine wasn't.)
+ Press "OK" on that window and the earlier one. You should now have just "Network and Sharing Center" and "Network Connections" windows open.
+ Open Mad Developer on the N900
+ Press "Manage USB"
+ Press "Load g_ether".
+ Press "Close"
+ Plug your N900 with the USB cord into your computer.
+ Press outside the selection box that pops up.
( + If this is the first time doing this with the N900 plugged into this USB port, it will say it's installing a driver.)
+ Launch X-Terminal on your N900.
+ Enter "sudo gainroot" or just "root". (This gives you root access.)
+ Type "ifup usb0" and press enter in X-Terminal. (This turns on internet-through-usb on your N900, in layman's terms)
( + You can also skip getting root acces and just type "sudo " before every command you need to run as root - it's just that the only commands you'd need for this are "ifup usb0", "ifdown usb0", and "ping", all of which need root access.)
+ Watch the new connection in either "Network and Sharing Center" or "Network Connections", it should say "Identifying..." for a while, then end up with "Unidentified Network", "Public", with "Limited Connectivity".
+ In the "Network Connections" window on your computer (The one you got to by pressing "Manage network connections" from the Network and Sharing Center), right click the new connection (It should be called Local Area Connection 2), and click properties.
+ Repeat what you did with the internet connection, but on this one, to make it get an IP address and DNS server address automatically. (Also might be already set to that, in which case you can just close that window without changing anything). If you do change it, you may need to wait a minute while the connection is "identified" again.
+ Go back to the properties of the connection that your computer is getting internet from.
+ Go to the sharing tab. You should now have a drop-down selection list under the first checkbox. Select Local Internet Connection 2 in that drop-down list and check the "Allow other network users to connect through this computer's internet connection" box.
+ Press OK.
+ On your N900, go to Mad Developer, press the Edit button, and check the "Use DHCP" button.
+ Press Configure.
+ On you computer, in the Network and Sharing Center, press Customize for your Unidentified Network of Local Area Connection 2 that appeared for your N900 after you did the "ifup usb0" step.
+ Check the Private box instead of Public. Vista will ask you for permission to continue when you hit "ok", just press continue as before.
+ Test by entering "ping www.google.com" in your N900's X-Term. (if you want it to stop pingin if it works either press Ctrl+C on your N900 while in X-Term, or close X-Term.)

If your computer is anything like mine, the connection should be saying "Local Only" instead of "Limited Connectivity", and the ping command should've worked. I do not use the dummy connection because the default browser and XTerminal recognize there's internet without it, so I can get programs with apt-get and surf internet just fine. (App manager can still load the app list if you click outside the menu that pops up asking you to select a connection, it just can't download them.)