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To uninstall IE:
For IE 6 : Control Panel-Add/Remove Programs- Add/Remove Window Components(Left Pane)- unchecked IE- OK-Apply and for IE 7/8: Control Panel- Add/Remove Programs- Windows IE7/8- Remove.
What about the Regedit (Registry Editor)? Anyway, here's the step to get rid of IE from the Regedit!
Step 1: key-in "regedit" from RUN command
Step 2: Search from Hkey_local_machine\Software\Microsoft\Active Setup\Installed Components\{89820200-ECBD-11CF-8B85-00AA005B4383}
Step 3: Change the value of IsInstalled (REG-DWORD) from 1 to 0(zero)
Step 4: Restart the computer to take effect!