Remember that any Windows password and even EFS is not secure if I have access to the machine plus if I boot another OS then it's rules apply.
Sorry but your question may be revealing you have either not researched this or are very new to the PC.
In my office there is a HP server with UNIX as OS.Oracle 9i is loaded in it at c drive with which a program is running. Now, my question is this that can I load another program in other drive say at D drive and able to protect is by password? secondly can I share the same oracle for this program as a seperate administrator ?.