If you go with today's just launched Microsoft toy and decided to install take care Metatrader 4 will not work such as with XP but maybe better than with Vista
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First.
Some bugs I found:
-Profile is not saved sometimes
-Icons lose last position when moved from original
-Chart lose last position on screen
-Charts does not remember last position or changes
This is more or less every time you run MT4 it's always with default settings.
To avoid problems.
When you install some Metatrader 4 on seven sometimes you will see a banner after installation end.
That banner says that Windows recommend to install software with different settings. Believe me, you want to say yes and run installation again with recommended settings.
as it's show below:
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If for some reason you miss this screen. After installation ends right click over MT4 icon and run compatibility mode again
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I highly recommend to download Windows Virtual PC and Windows XP Mode. But not only for MT4. I'm sure you will have several software a couple of years old.
Windows Virtual PC: Home Page
Both updates are free and with XP Mode you will also win a fully functional XP installation.
Virtual PC will prevent that old software designed to previous version of windows keep working.
Meanwhile XP Mode is a different approach, besides 500mb size. It will let you run XP virtualized on your Windows 7 box.
You can also check for application compatibility on this link
Windows 7 Compatibility Center home
Fortunately
Metatrader 5 will run just fine.