can i install windows 7 again after upgrade Clean Installation

Hello, Im new to this, and my question is sort of the same, i have a family pack of Home Premium and i need to do a clean install of windows 7 because of problems but i do not want to use another product key of the three, i have already used two and one of them is the computer i want to do a clean install on, will it use another product chance?

Thanks
 

My Computer My Computer

At a glance

Windows 7 Ultimate 64bitIntel(R) Core(TM) i5 CPU 760 @ 2.80GHz, 2DDR3 (3x4Gb)ATI Radeon HD 5750
OS
Windows 7 Ultimate 64bit
CPU
Intel(R) Core(TM) i5 CPU 760 @ 2.80GHz, 2
Motherboard
iMac 2011 Model
Memory
DDR3 (3x4Gb)
Graphics Card(s)
ATI Radeon HD 5750
Monitor(s) Displays
27" imac
Screen Resolution
2560x1440
Hard Drives
1Tb
Keyboard
Apple Wireless
Mouse
Magic Mouse
Internet Speed
46Mbs
You can reinstall retail Win7 with the same valid key as many times as you want. If your hardware changes, you might need to make a robocall during activation to update it.

When you boot the DVD it will scan the HD to see any OS, which is enough to pass a flag allowing use of Upgrade version key.

If you need to wipe the HD first to clean possible infection, then you will need to run an Upgrade install from the newly installed Win7 desktop to get it to accept Upgrade version Product Key.
 
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