http://windows.microsoft.com/en-us/windows7/help/upgrading-from-windows-xp-to-windows-7

http://windows.microsoft.com/en-US/windows7/products/features/windows-easy-transfer

http://technet.microsoft.com/en-us/library/dd365353%28v=ws.10%29.aspx

1. Verify the new server's TCP/IP configuration has been pointed to the current DNS server. 2. Make the new server become a member server of the current Windows Server 2003 domain. 3. Upgrade the Windows Server 2003 forest schema to Windows Server 2008 schema with the “adprep /forestprep” command on old server. 4. Upgrade the Windows 2003 domain schema with the “adprep /domainprep” command on old server. 7. Run “dcpromo” on new server to promote it as an additional domain controller in existing Windows 2003 domain, afterwards you may verify the installation of Active Directory. 8. Enable Global Catalog on new server and manually Check Replication Topology and afterwards manually trigger replication (Replicate Now) to synchronize Active Directory database between 2 replicas. 9. Disable Global Catalog on the old DC. 10. Transfer all the FSMO roles from the old DC to the new DC. 11. Verify that the old DNS Server Zone type is Active Directory-Integrated. 12. Install DNS component on new server and configure it as a new DNS Server (Active Directory Integrated-Zone is preferred). All the DNS configuration should be replicated to the new DNS server with Active Directory Replication.

Run dcdiag and netdiag from the command prompt on the old machine to check for errors. If you have some, solve them first. For these tools you have to install the support\tools\suptools.msi from the 2003 installation disk.

Add the new 2008 R2 server to the domain as a member server.

Prepare the current Active Directory forest to accept a Server 2008 R2 DC. You do this by running

Adprep.exe /forestPrep (Adprep32.exe /forestPrep on x86 server)

on the current DC. Adprep is found on the Server 2008 R2 installation DVD in the Support\adprep folder. Some Antivirus software can sometimes interfere with this command. You may want to temporarily disable the antivirus service from running on the Schema Master until the process has been completed.

http://technet.microsoft.com/en-us/library/cc731728%28WS.10%29.aspx

The next step is to run Adprep.exe in each domain, while logged on to the domain controller holding the Operations Master FSMO role. This command is only run on that server. You do not run this command on each domain controller. You must be logged into that server as a Domain Admin. One of these two commands should be run.

Adprep.exe /domainPrep Adprep.exe /domainPrep /gpPrep

If you already ran the /gpPrep parameter for Windows Server 2003, you do not need to run it again for Windows Server 2008 or Windows Server 2008 R2. This command adds only the inheritable access control entries (ACEs) on Group Policy objects (GPOs) in the SYSVOL shared folder. The additional ACEs give enterprise domain controllers read access permissions on GPOs. These permissions are required to support Resultant Set of Policy (RSOP) functionality for site-based policy.

Insert Windows Server 2008 Installation Disc in the new server. Run “dcpromo” on new server to promote it as an additional domain controller in existing Windows 2003 domain, afterwards you may verify the installation of Active Directory.

http://support.microsoft.com/kb/816106

Enable Global Catalog on new server and manually Check Replication Topology and afterwards manually trigger replication (Replicate Now) to synchronize Active Directory database between 2 replicas.

http://technet.microsoft.com/en-us/library/cc755257.aspx

To add or remove the global catalog

1. Open Active Directory Sites and Services. To open Active Directory Sites and Services, click Start , click Administrative Tools , and then click Active Directory Sites and Services .

To open Active Directory Sites and Services in Windows Server® 2012, click Start , type dssite.msc .

2. In the console tree, click the server object to which you want to add the global catalog or from which you want to remove the global catalog.

Where? Active Directory Sites and Services\Sites\SiteName\Servers

3. In the details pane, right-click NTDS Settings of the selected server object, and then click Properties .

4. Select the Global Catalog check box to add the global catalog, or clear the check box to remove the global catalog.

Check that replication has completed. At a command prompt on the the new DC

nltest /server:<servername> /dsgetdc:<domainname>

Verify that the isGlobalCatalogReady attribute has a value of TRUE.

After replication is completed disable Global Catalog on the old DC.

Transfer FSMO roles from old server to new server.

http://support.microsoft.com/kb/324801

Verify that the old DNS Server Zone type is Active Directory-Integrated.

http://support.microsoft.com/kb/816101

Install DNS component on new server and configure it as a new DNS Server (Active Directory Integrated-Zone is preferred). All the DNS configuration should be replicated to the new DNS server with Active Directory Replication.