>Is there any way to see everything that an installation chnages? I want to know folders created, registry keys changed, files installed, etc.

Take a look at the utilities from Sysinternals (now part of Microsoft). The Filemon utility shows file system activity in real time, while the Regmon utility lets you watch registry activity in real time. Together they should do what you want. The Sysinternals home page is http://www.microsoft.com/technet/sysinternals/default.mspx. Filemon is in the File & Disk Utilities section, Regmon is in the System Information section.