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Running Older Software in Vista
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One concern for Windows XP users is whether their favourite software applications will run once they upgrade to Vista.

Luckily, Windows Vista uses a feature called Compatibility Mode which tells the software application that Vista is actually an older operating system, specifically Windows 95, 98, Me, NT, 2000, or XP. (In other words, your operating system will lie to your old software just so that it will feel compatible. That's friendly, huh?)

Here's how it works:

If your software application won't install, open or work properly, right click on the application's .exe file. Select Properties and then click the Compatibility tab. From there, pick the previous Windows operating system you were on (most likely Windows XP).

Compatibility Mode

Information in this tip is from Cnet Reviews