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I would suggest contacting the manufacturer of the computer and ordering a set of recovery disks for this computer. Sooner or later you are going to need them and not having them can be a real hindrance.
If the fix suggested by dai does not work please follow the next instruction:
Free unlimited installation and compatibility support is available for Windows XP, but only for Service Pack 3 (SP3). This support for SP3 is valid until April 14, 2009. For more information about this policy, visit the Windows XP Support Lifecycle page located at http://support.microsoft.com/lifecycle/?p1=3223
. Chat and e-mail support is available only in the United States and Canada. For all other Windows XP issues, visit the Help and Support site at http://support.microsoft.com/oas/def...spx?gprid=1173
, and then choose your product.
Help and Support Microsoft Windows XP Service Pack 3 (All Languages)