I'll try not to sound to technical for you, but if you're not sure you trust yourself I'd say wait for your bro. I'm not on my Vista machine at work, so I'm going to try to walk you through the steps by memory. Here goes...
The problem might be related to the power settings on your NIC or your wireless modem. Do you plug your computer in to get internet connection, or just use wireless?
If you go to the start menu and right click on "Computer" you should see an option that says "Manage". Click on that option. Your computer management console will come up and you should see an option for Device Manager. Click on that option and you should see all of the devices on your computer, including "Network adapters" which is what you want. You most likely have two options under Network adapters, so try this with them both. This time you're going to right click and choose properties. On the properties screen, you should see "Power Management" as one of the tabs at the top. When you choose that power management option, you want to see if there is something that says "Allow this device to bring the computer out of standy" or something along those lines. If that option has a check mark, remove it and then also remove any check marks that will allow the computer to turn that device off. You will want to repeat this step for the other device under "Network adapters" as well to make sure that your computer will work properly if you're connected with wireless or hard line.
I hope this works, and if not I'm sorry if your time has been squandered.
Edited by Eric RBA, 23 February 2009 - 02:22 PM.