SQL Server 2008 R2 (32 Bit)

Dear all,

My current SQL Version is SQL 2008 R2 (32BIT).I want to upgrade this to SQL 2008 R2 (64 BIT).

Do I need to Uninstall SQL SERVER 2008 R2 (32 BIT) and then again run the installation of SQL SERVER 2008 R2(64 BIT)?

What will happen to my data backup of 32 BIT?Can I restore the data base on 64 BIT?

What are the steps to be followed during this upgrade? 

Regards

Sandy

Sandeep Kumar