Formula One Unknown Interface Error

Hi, I'm using Builder 4 Enterprise version
and making a small program that requires reading Excel data.
So I used the "formula One" OCX which was installed in Builder 4.
It worked well for a time, but nowawdays this program crashes
with message
" Project Project2.exe raised exception class EOleSysError with Message
'unknown interface',Process Stopped.Use Step or Run to Continue".

Do I Need to Reinstall Builder? My friend's graduation depends on this
program.
I need your help.