Windows Installer Service Problem

I have installed Win XP latest - fresh intall (all updates installed)
on my new 'puter, but have run into an interesting problem. When I
attempt to install PCBackup on the system, I get the following error
message:

"This installation package cannot be installed by the Windows
Installer Service. You must install a Windows Service Pack that
contains a newer version of the Windows Installer Service."

I have checked and Microsoft says I have the latest installer. I even
re-downloaded the most recent installer and re-installed it to no
effect.

The techies at StompSoft have no idea as to the cause. I can install
the executable file on other computers, so I believe it is not a
problem with the file.

Any suggestions or advice would be most appreciated.

Thanks!
.

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