Install Genuine copy of Win 7 in a pc with pirated win7-XP dual boot

[logamuthu]

 ???My PC is Dell Inspiron All In One 2020 with 4 GB RAM.
I am a novice to win7-XP dual boot. Pls help!
A service engineer installed Windows 7 (probaby pirated) (7 in C:) and then XP ( XP in D:) but advised me not to use Windows Updates!
I now have a genuine copy of windows 7 and would like to install genuine Win 7 over the previous (?pirated) install so that I need not face Windows Genuine problem and can use Windows Updates too.
Please tell me whether there will be any problem?
If there will be no problem, please help me with detailed instructions - as for a dummy / idiot / noobie - how to overwrite Windows 7 only and retain the Win 7 (Genuine)- XP dual boot and all data in the other drives.
TIA!
Prof.Dr.K.Loga muthu krishnan,
Senior Consultant Neurosurgeon,
Chennai,
India.
E-Mail: [email protected]

[Linux711]

This will show you how to install Windows 7 and XP to dual boot with when you already have either Windows 7 or XP installed first.

http://www.sevenforums.com/tutorials/8057-dual-boot-installation-windows-7-xp.html