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Windows 7: Can you tell if a clean install

18 Sep 2010   #1

Window 7 Home Premium 64 bit
Can you tell if a clean install

I have Window 7 pre installed on a 64 bit Lenovo machine. Is there a way to tell if it was a clean install vs a upgrade?

My System SpecsSystem Spec
18 Sep 2010   #2

Windows 7 Ultimate x64 SP1

If you bought that Lenovo brand new, it most likely was a clean install. Upgrades aren't all that obvious sometimes though but issues with them often manifest themselves in very strange ways. But again, if it was new or even refurbished, I seriously doubt it was an upgrade. If you bought it used however, tough to say. Haven't done too many upgrades but from what I've seen, I believe there are folders left over with odd names such as "INPLACE" and some others akin to that.
My System SpecsSystem Spec
18 Sep 2010   #3

Window 7 Home Premium 64 bit

The reason I asked is I bought a Lenovo Y550 just when Windows 7 came out and it was shipped with Vista instead. Lenovo acknowledged the problem. Machine was sent back for a clean install but I just want to check it was not upgraded like the upgrade disc they sent out but was a total clean install.
My System SpecsSystem Spec

18 Sep 2010   #4

Windows 7 Ultimate 64-bit

If you go to your 'Local Disk' Windows was installed on (normally C : (no space)) and you find a Windows.old folder that definitely means it wasn't a clean install. That folder would of been created if they installed Windows 7 on the same drive as Windows Vista without formatting (via the 'Custom' installation option) which definitely isn't a clean install. Though if they choose the 'Upgrade' installation option, the Windows.old folder wouldn't have necessarily been created. Hope that made sense.
My System SpecsSystem Spec
18 Sep 2010   #5
Microsoft MVP


Are you having issues, because you can boot that Upgrade disk to clean reinstall if you want.

If the machine still has factory utility partitions, you might even want to wipe the HD first of conflicting factory code so you have the cleanest slate: SSD - HDD Optimize for Windows Reinstallation

Clean Install with a Upgrade Windows 7 Version
My System SpecsSystem Spec

 Can you tell if a clean install

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