Microsoft's Knowledge Based guidance may help;
I noticed a weird thing there! Your error message mentioned XP being in Safe Mode. That KB article says the error could be because XP is in "Normal Mode"!
It's good to see that there are humans at Microsoft, and they are prone to mistakes just as we all are.
When I try to run a setup that uses Windows Installer, I get an error.
"The Windows Installer service could not be accessed.This can occur if you are running Windows in safe mode, or if the Windows Installer is not correctly installed." Screenshot: http://img37.imageshack.us/img37/5520/problem1w.png Can anyone help me? I am running Windows XP Professional SP3 by the way.