Office XP Pro 2003

Office Pro 2003
Above running under XP sp1
Excel has decided to stop working all others OK including B.C.M.

Have tried Detect & Repair with message “verify patch package exists etc.etc”.

Cannot uninstall or reinstall Office error message package cannot be opened, verify patch package exists etc.etc.

Have tried “sfc /scannow” and no problems are found

Any ideas please.