Hi Subhakanta, welcome to the Seven Forums.
To be able to assist you, I need to ask you to clarify a few things. I assume your operation system is Windows 7 Home Premium, 7HB does not exist.
- Which virtualization program you have installed? (Oracle VirtualBox, VMWare, VMLite, Microsoft Virtual PC?)
- How did you install XP to virtual machine? From a CD/DVD? From a so called ISO file? Or did you use a program to create an XP virtual machine from your old XP computer?
- What do you mean with SUB drive? Do you mean an external drive connected to your computer's USB port?