ubuntu 12.04, together with Windows XP Pro, blocks the windows access to Verizon modem when Windows XP Pro is booted

[compdoc]

> I have the Actiontec modem connected by ethernet to my desktop. Access 
> to the internet is normal for the UBUNTU but when I exit and boot into 
> Windows XP Pro there is no connection.

You use the same network card for each OS? What ip address does XP obtain?

In a dos window try: ipconfig /all