Uninstalled Oracle XE, now can't reinstall. Any suggestions?

I have been working for some time with Oracle Express,, installed on Windows Vista (yes, I know. You have to go with what you have available). Unfortunately it got into an odd state (tablespaces I couldn't remove) so I decided to uninstall and reinstall. I used the uninstaller, but it left a lot of files and other things on the system. I deleted these by hand, but now can't reinstall; the installer tells me I already have an instance on the system, and it can't proceed. I have:
- cleaned all Oracle-related entries out of the registry, with the exception of items that appear to belong to Microsoft (start with microsoft or x86-microsoft)
- removed all files that seem remotely oracle-related
- cleaned all entries out of the start menu
- cleaned all entries out of the environment variables
Has anyone come across this problem? Is there a solution? Or am I going to have to blow away the contents of my hard drive and start again. (In which case I would perhaps go to Windows 7 and run XE on a virtual machine, as recommended elsewhere.)
Thanks for any help!

I followed all the steps, and it didn't help. Thanks, anyway.
After a (very inconvenient) period of working with a remote database, I now have time to get back to this issue.
I had been trying to install the Western European edition (smaller); I tried downloading the universal edition, and running this installer got me past the original error message. Unfortunately the installation still fails, but later, which is progress of a sort. The error is now:
"Error applying transforms. Verify that the specified transform paths are valid. C:\Users\
MYNAME~1\AppData\Local\Temp\ _is342C\1033.MST"
A colleague thinks that this is because some transform data was left in the registry by my failed uninstall, and needs to be cleaned out. I had the install output a verbose log, and he's looking at it.
Ideas are still welcome.
One other thing: now when I try to run the Western European installer, it fails at the new, later place. I can only assume that the universal edition installer cleaned up whatever was causing the original error.

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