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#21
There will be no problem installing in Legacy Mode once you wipe the HD following the steps in Bypass UEFI to Install WIn7 . This has worked for everyone thusfar who couldn't get a UEFI install to work for Win7.
If you want to try UEFI install with USB flash stick it requires special edit of files as shown in Step 11 of UEFI Bootable USB Flash Drive - Create in Windows.
This may be worth a try if UEFI DVD install won't work as shown in UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Forums
BTW the Windows Home Premium Upgrade Family 3 pack allows install on any 3 PC's at a time. Like any Win7 retail license it can be reinstalled or moved to other hardware as often as you like as long as it qualifies by having XP or Vista previously on the PC, or a retail copy of XP or Vista on hand which is not used again while it is qualifying for the Upgrade. These qualifiers do not need to be installed first - this is on the honor system.