How to remove passwd cache

Dear All

I am having windows workgroup setup in my office and i shared one folder in each pc for data communication. After booting the PC while accessing the shared folder it’s asking passwd for that shared folder. If i try to open the same shared folder again it’s not asking passwd. I want to give passwd to access the shared folder eachtime when i try to access. Kindly provide me the solution.

Thanks in advance
Sakthi