To check the operating system of your computer (XP or 2000)
Right click "My Computer"
then click properties
Under "System" you will see the name of your operating system.
If you are not using Windows XP (XP has an automatic patch), launch Timezone editor here
Click "Open" and "Yes" until you get to the Windows Timezone Editor
Select Eastern Time and click "edit"
Set the choices as above. Then click "OK" and "Close"
Double click the time in the bottom right hand corner of your computer

Click the "Time Zone" tab
Choose any timezone other than Eastern and click "Apply" and then reset to "Eastern and hit "OK" as below
Now your computer is ready for the time change.