Upgrading from Powershell 1.0 to 2.0

Hello All,

Could anyone provide information to upgrade the Windows Powershell version from 1.0 to 2.0

Target OS which has Powershell 1.0 are Windows 2003 and 2008 and upgrade to 2.0. 

I have reference to below Article:

http://support.microsoft.com/kb/968929

Is it correct article ? Or anyone has additional information. 

Can we uninstall 1.0 and later need to install 2.0? Or, 2.0 can be installed over existing 1.0 without any issue?

what are requirements:.NET Framework 2.0 SP1, or anything else?

Thanks In Advance!