Scheduled Tasks May Not Run and Generate an Exit Code of 80 - see Microsoft article 812400:
http://support.microsoft.com/?kbid=812400
RESOLUTION:
Service pack information:
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
322389 How to obtain the latest Windows XP service pack.
WORKAROUND:
To work around this problem, disable the Human Interface Device Access service (the HID Input service), and then restart the computer.
STATUS:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows XP Service Pack 2.
Go to:
http://support.microsoft.com/windowsxpsp2
For windows XP Service Pack 2.
Installing Service Pack 2 (SP2):
http://support.microsoft.com/xpsp2getinstall
----------
Best Solution: Download and Install Service Pack 2.