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Back up all data to a different location on your network. Confirm that the backups are legit.<br />
Format Server and install Server 2012. <br />
Consider using Hyper-V.. Server 2012 (Standard) gives you rights to 2 virtual machines.<br />
<br />
Read this article if you plan on running the sql versions together on the same server.<br />
<a href="http://msdn.microsoft.com/en-us/library/ms143694.aspx" rel="ugc">http://msdn.microsoft.com/en-us/library/ms143694.aspx</a>
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Back up all data to a different location on your network. Confirm that the backups are legit.
Format Server and install Server 2012.
Consider using Hyper-V.. Server 2012 (Standard) gives you rights to 2 virtual machines.

Read this article if you plan on running the sql versions together on the same server.
http://msdn.microsoft.com/en-us/library/ms143694.aspx [http://msdn.microsoft.com/en-us/library/ms143694.aspx]

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We need to upgrade our SQL server.<br />
<br />
Current operating system: windows Server 2008 R2<br />
SQL version: SQL server 2008 R2 Enterprise and SQL server 2012 Enterprise<br />
<br />
We need to upgrade it with <br />
New operating system: windows server 2012 R2<br />
SQL version : SQL server 2008 R2 Enterprise and SQL server 2012 Enterprise<br />
<br />
We need to upgrade the operating system of the SQL server as we are already using SQL server 2012 Enterprise in current use: windows server 2008 R2.<br />
<br />
Kindly suggest...!!
</div>
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We need to upgrade our SQL server.

Current operating system: windows Server 2008 R2
SQL version: SQL server 2008 R2 Enterprise and SQL server 2012 Enterprise

We need to upgrade it with 
New operating system: windows server 2012 R2
SQL version : SQL server 2008 R2 Enterprise and SQL server 2012 Enterprise

We need to upgrade the operating system of the SQL server as we are already using SQL server 2012 Enterprise in current use: windows server 2008 R2.

Kindly suggest...!!

Windows server 2008 R2 to 2012 R2 upgrade

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.