I've already answered for exactly the same question at google groups
In first you should look at the official documentation which is available online here.
You have very old system, so you should install new version of Ensemble at new windows server. Installation Guide
And copy all of you data from old server to new. But it is may be very difficult task, without knowledge about your application.
As well you should look at Cache Upgrade checklists archive and latest, and Ensemble Release Notes