Hi Scottyboy
This link should help you:
How to disable Fast User Switching in Windows Vista
Note: If running a home edition of Windows Vista you will need to use the registry editing method as gpedit.msc is not available in home editions.
If you decide to do that. Please make sure you backup the registry first and are very careful when editing it.
To backup the registry:
1. On start type regedit and open it.
2. Go to file. Export
3. Ensure the export range is set to all
4. Save the backup in an appropriate location
Hope that helps.