1.Please Uninstall SQL Server 2005 Properly ( or any other version ) - Remove all traces
Giving u full install details -
click on autorun.exe
SQL Server 2000 components - Install Database Server-
Chose install on Local Computer -
Create A New Instance Of Sql Server , Or Install Client Tools-
Chose Company name and shit ur self
Chose Install Server And Client tools
Use Default Instance
Typical Settings
Check Use Local System Account Instead Of Domain System Account
Chose Mixed Mode Of Authentication
While installation enter use SA password as - 123456
Ok - Done