How to unistall oracle 10g Completely

I tried for uninstalling Oracle,
First I removed from Add/Remove Programs.. But its not removed entirely..
When I reinstall again ...It's installing on another location...
So really its irritated like anything...

Then I followed below steps then its worked fine...

# Stop any Oracle services that have been left running.
Start->Settings->Control Panel->Services
Look for any services with names starting with 'Oracle' and stop them.

# Run regedit and delete the following keys (some may have slightly different names in your registry):
HKEY_CURRENT_USER\SOFTWARE\ORACLE
HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\EventLog\Application\Oracle.oracle
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\OracleDBConsole
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\Oracle10g_home
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\OraclService

Note that the services control panel will still show the old services until you reboot.

# Delete the Oracle home directory
C:\Oracle

# Delete the Oracle Program Files directory:
C:\Program Files\Oracle

Note: For above steps , while deleting may be some dll files makes some problem
like cant delete access denied ... For that rename and move that specfied dll then restart the m/c then delete

# Delete the Oracle Start Menu shortcuts directory:
C:\Documents and Settings\All Users\Start Menu\Programs\Oracle*
Where * indicates the name of your install. Look for and remove all Oracle directories from that location.

# Remove Oracle refereces from the path. To edit your path go to:
Start->Settings->Control Panel->System->Advanced->Environment Variables
Edit both of the environment variables user PATH and system PATH. Remove any Oracle references in them.

# Remove Oracle.DataAccess and any Polic.Oracle files from the GAC which is at:
C:\Windows\assembly\

Your system is Oracle free after this. So go ahead and now install a new instance of Oracle.