This might help.
From an internet help site -
Watch the clock: the date and time on your computer must be correct. Several aspects of connections to secure sites like MSN Hotmail rely on your clock being accurate.
Use the clock synchronization facility in Windows XP. Right click on the clock in your taskbar, select Adjust Date/Time, click on the Time Zone tab and ensure that the time zone is set correctly. Then click on the Internet Time tab, check the Automatically synchronize with an Internet time server. Click Update Now to update the time immediately.