How can I transfer my templates from MS Office 2003 Pro running on Win XP Pro to MS Office Pro to MS Office Pro 2010 running on Win 7 Ultimate?
The simplest way is to copy the templates to the new PC and use them without changes.
You may want to convert the templates from the 2003 format to 2010 format. This will allow you to use new features in the templates.
This article has more information about managing templates.