How to Uninstall Oracle 11g And Install Again in Windows7

How to Uninstall Oracle 10g in Windows7
 Uninstall all Oracle Components using the Oracle Universal Installer(OUI). but it is not appear in then follow below steps.
Step-1 
Go to Window Button -> click on it--> search for programs and Features.


Step-2
It is going automatically in Programs and Features Window now uninstall Oracle.

Step-3 
Now install the Oracle but You get an Error after 4th step when you enter Username And Password that is(ORCL and Admin).

ERROR-1
The choosen software already installation in the given oracle home.

ERROR-2
The specified sid is already in use

Step-4
ERROR-1
Go to the Folders in C:/Programs Files(x86) and check the Oracle folder delete it. and also delete from Recycle Bin.

ERROR-2
Go to (WIN BUTTON+R) type (Regedit) Then You get a Registry Editor.
Go to HKEY_LOCAL_MACHINE

Delete All files in HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE KEY

Delete All files in HKEY_LOCAL_MACHINE\CurrentControlSet\Services\ORA* ,and  delete all related to Oracle Files.

Step-5
Reboot the Machine and Install the Oracle Again.

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