Cannot create new company and cannot switch to multiple user mode.

SUGGESTED

I have Sage50 CA Premium version and when i open the sample data and switch to multiple user mode, it has "The program could not process this transaction" error., and saying there is problem with the company information data.

When I'm trying to create new company, after fill in the information, it always has the error saying "other user are currenlty working with this company ...", but in fact there is no one but me creating the company.