Keep Your Old Software
As time progresses and new versions of Windows are released, a large amount of software is left by the wayside. While efforts are made in modern operating systems like Windows XP, Vista and 7 to allow some compatibility with older software, this isn’t given too much attention.
It is difficult for Microsoft to make their operating systems fully compatible with third party software – it is much simpler for these third parties to release updates or new versions of their applications.
In many cases, buying these new versions can be an unnecessary expense, especially when a new operating system has just been purchased. If you have a vital application that you need to carry on using but sadly cannot get to run under a new operating system, you might consider a way of running retro operating systems - Windows 95, 98, Me, for instance.
Whatever you have a legal copy of, you can install. There are two ways of doing this – by partitioning your hard disk, and by virtualization.