How to tell if you have SP1 Loaded

Method1)  Open Control Panel/System - the default Tab will be General, and under the word "System:" it will say:

Microsoft Windows XP
Home Edition
Version 2002
Service Pack 1

Method 2)

1) Open Control Panel/Add Remove Programs
2)  if it has been upgraded to SP1, there will be a new icon on the lower left pane called "Set Program Access and Defaults"