Could not open key on a Windows XP system

I am receiving the following error message while trying to install Microsoft Office Word on my Dell computer pre-installed with Windows XP Professional: Error: 1402. Could not open key H-key_local_machinesoftwaremicrosoftwindows currentversionrunoptionalcomponentsmsfs.
Verify that you have sufficient access to that key or contact your support personnel. Can anyone help me solve the issue?
