I get error during the installation. How can I get detailed error description?

To get detailed error description please follow the next steps:
1) open IIS home directory (usually C:\inetpub)
2) navigate to "wwwroot\wss\VirtualDirectories"
3) navigate to appropriate folder (usualy 80 for default web application)
4) open "web.config" file using notepad
5) Search for: CallStack="false"
6) Replace with: CallStack="true"
7) Search for: customErrors mode="On"
8) Replace with: customErrors mode="Off"
9) Search for: debug="false"
10) Replace with: debug="true"