I had Pentium III 600Mhz system. I have upgraded my motherboard to ASUS A7N8X Deluxe with AMD Athelon XP 2100. I didn't format the hard drive because I thought it might work without formatting my whole hard drive. I have lots of stuff in my hard drive and don't want to delete eveything. If motherboard is chaged, do I have to reinstall the operating system? Is there any way to save my old stuff without duplicating the hard drive or buying a new hard drive disk? Or simply, just need to reinstall the operating system by formatting my HDD?