How can I change the link in the left hand pane of the printers pane?

A. By default the printers panel has a link to Microsoft support but you may wish to change this to something more local:

Start the Active Directory Users and Computers MMC snap-in (Start - Programs - Administrative Tools - Active Directory Users and Computers)
Right click on the domain and select Properties
Select the Group Policy tab
Select the 'Default Domain Policy' object and click Edit
Expand Computer Configuration - Administrative Templates - Printers
Double click 'Custom support URL in the Printers folder's left pane'
Select Enable, and set the URL Title and URL, click Apply then OK
Click here to view image
Close the Group Policy and the MMC snap-in

The Printers panel will now show your link.

This can also be set by directly editing the registry at HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Printers