A possible solution:
The problem isn't interference, it isnt the router. The problem has to do with the power settings for the wireless card itself.
To *attempt* to fix it:
1. Right click on "My Network Places" and hit properties.
2. Right click on your wireless connection icon and hit properties.
3. Under the "General" tab, click on the Configure button next to the device description (the button next to the box with the label "Connect Using:"
4. Click on the "Advanced" tab
5. Click on "Power Management" in the list box and then uncheck the "Use Default Value" box and set the slider to "highest".
You may need to update your drivers before you can get to these menus, to do that, go to the Intel website and search their support for drivers for the Intel Pro/Wireless 2100 series. They should only have a couple drivers to choose from.