HP Media Center PC m1050e - Can't connect to internet after upgrade from XP to Windows 7

My desktop PC with Windows 7 will not connect to the internet after upgrading from XP to Windows 7 Home Premium.  This upgrade actually required saving files and a fresh install of Windows 7.  When getting Router support help to load a new driver, I keep getting a an error message "Realtek Network Contoller Was Not Found".  They say it's an issue that HP will need to help resolve.  Can anyone help?
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Thank you very much for your help.  I will look into the two options you gave me.

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