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Windows XP Tips, Illustrations and registry edits
When you click Invite someone to help you link in the Remote Assistance page in Help and Support Center, you may see the following message:
An Administrator has denied permission to use Windows Messenger. For more information contact your Administrator.
This happens if the PreventRun policy setting is enabled in the registry or via Group Policy Editor. To remove this restrictions, try this:
HKEY_CURRENT_USER \ Software \ Policies \ Microsoft \ Messenger \ Client
HKEY_LOCAL_MACHINE \ Software \ Policies \ Microsoft \ Messenger \ Client
Close Registry Editor and restart Windows. Now, open Help and Support Center. The restrictions message should no longer be displayed.
Click Start, click Run, type gpedit.msc, and then press ENTER. Double-click the following items to expand them:
Local Computer Policy
=> Computer Configuration
==> Administrative Templates
===> Windows Components
====> Windows Messenger
Double-click Do not allow Windows Messenger to run, and then click Disabled. Click OK, and then quit the Group Policy snap-in.