Getting Vista's wifi to work with Sonicwall's DHCP

Vista seems to have a problem with Sonicwall's DHCP.
The problem is in the ARP validation. Sonicwall keeps reporting the validation as a diffrent computer.

The following steps can be found at: http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=1022914&SiteID=17

I am reporting them here to keep them from dissapearing:

1. Click the Start button.
2. Select All Programs > Accessories.
3. Right click Command Prompt and click Run as administrator.
4. Type regedit.exe and press enter.
5. Go to the following location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
6. Right click this entry and select New Dword.
7. Rename the new entry ArpRetryCount (leave it set to 0 by default).
8. Restart the computer.
9. Reassociate with the SonicWALL.

You should notice a successful connection.