It's possible to give installed applications a Help and Support link, visible in the Programs and Features section. If this isn't too hard it might be worthwhile.
Start at http://msdn.microsoft.com/en-us/library/aa368032.aspx and http://blogs.technet.com/b/alexshev/archive/2008/02/09/from-msi-to-wix-part-2.aspx. Looks like the following might work:
<Property Id="ARPHELPLINK" Value="somelink.com" />
Customer support service by UserEcho