Best way for u to use XP is this.
Windows XP Mode for Windows 7 makes it easy to install and run your applications for Windows XP 32-bit directly from your Windows 7 32-bit or 64-bit based PC.
Windows Virtual PC: Requirements
1 GHz 32-bit / 64-bit processor required
1.25 GB required, 2 GB memory recommended
Recommended 15 GB hard disk space per virtual Windows environment
Supported host (your computer) operating system:
NOTE:Windows XP Mode can only be installed on Windows 7 Enterprise, Windows 7 Professional, and Windows 7 Ultimate.