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The installer is unable to instantiate the file KEY_XE.reg

I got this error when installing Oracle Database Express Edition 11g 32 bit on my Windows 7 64-bit machine.

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Error
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The installer is unable to instantiate the file C:\Users\<your user name>\AppData\Local\Temp\{60712028-B7B0-4EC3-9C28-663111EC954A}\KEY_XE.reg.  The file does not appear to exist.
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OK
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I was using Oracle Database Express Edition 11g Release 2 for Windows x32 because at the time there was no 64 bit version for Windows 7.

The answer I found was in a response to an Oracle forum post: XE11: KEY_XE.reg cannot be loaded on WIN7 prof 64b and I have integrated that process into the instructions below.

  1. Unzip the downloaded installer OracleXE112_Win32.zip somewhere. 
    unzip /C/Users/<your user name>/Downloads/OracleXE112_Win32.zip -d /C/Users/<your user name>/Temp/OracleXe
chmod -R 777 /C/Users/<your user name>/Temp/OracleXe
  2. Run the exe: C:\Users\<your user name>\Temp\OracleXe\DISK1\setup.exe.
  3. Click NEXT > click I accept.. > STOP!
  4. If you continued, you would see the error this post is about. Did you ignore these instructions and continue anyway? That's OK.
    1. Accept the error (click OK).
    2. Let the install finish.
    3. Un-install Oracle Express.
    4. Delete C:\oraclexe
    5. Start again.
  5. You should now be on the screen: Choose Destination location. DO NOT PRESS NEXT YET.
    1. Open Windows Explorer to C:\Users\<your user name>\AppData\Local\Temp and look for a folder that the install just created. It will have a name like this: {60712028-B7B0-4EC3-9C28-663111EC954A} and will be the same as what was reported in the error dialog.
    2. Inside that folder, find the file OracleMTSRecoveryService.reg and make a copy of it. Rename the copy to KEY_XE.reg.
    3. Now go back to the installer and press NEXT.
  6. Specify Database Passowords: someSecurePassword.
  7. Verify that the Current Installation settings are OK: 
       Destination Folder: C:\oraclexe\
   Oracle Home: C:\oraclexe\app\oracle\product\11.2.0\server\
   Oracle Base:C:\oraclexe\
   Port for 'Oracle Database Listener': 1521
   Port for 'Oracle Services for Microsoft Transaction Server': 2030
   Port for 'Oracle HTTP Listener': 8080
  8. Install finished.

This worked for me on my previous install on a Windows 7 box.

This week I had to set myself up on a new Windows 7 64-bit install. I went through the steps I outlined above and the install seemed to work but I encountered another problem: Connected to an idle instance; trouble creating DB. The fix for this issue was to un-install the 32-bit Oracle Express and install Oracle Database Express Edition 11g Release 2 for Windows x64 - the 64-bit installer. I did not get the same error (The installer is unable to instantiate the file) when installing the 64-bit version.

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