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I know that installing double glazed windows is obligatory in private property in case of replacement, but how about commercial property? Do I have to use double glazed windows in the shop?
Ask your local Building Inspector. Usually improvements to
2.Clean install that mean you will format the partition older Windows places. And install new one. You have to reinstall all application require for your work.

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Sorry for My English. So bad. But just need asker understand what I talk about.
an upgrade installs over top of your current installed Windows operating system, you don't loose any programs or documents doing an upgrade. A clean install is just the opposite, you loose everything on your computer, all programs, documents and such. If it is only a test computer i would recommend doing a clean install, or creating a partition and dual booting windows 7 and your current OS
They really aren't different. Upgrade will take your existing data and move it to Win7, then basically blow everything away and re-image, then put your stuff back.

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existing property are not retrospective. But it would be wise to enquire.
Upgrading that mean you already have a previous version of Windows is exsiting on your system. Upgrade will replace older version of Windows with a newer without losing any Personalized Setting and applications were installed on previous version.
Clean will just wipe everything clean and start from scratch. Beware tho- the upgrade doesn't always grab all of your stuff. Def make a backup before you do it.
IM or email me if you have any questions.

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Yes, there's a difference. To install is generally used to describe the loading of a particular program where no previous version of that program has been on the computer. To upgrade is to add a new version of a program, replacing a version that was on the computer's hard drive.
I'm planning to replace the front windows of the shop.