Cannot run in low isolation mode

I'm running IIS 6 in IIS 5 mode. I set up the virtual directories to run my
app. in low isolation mode but when I try to start up my app, it gets put in
a dllhost
wrapper. It used to work just fine but I tried setting up a COM+ package
for my app.
(which didn't work) and I tried to undo what I had done but something is
still set to cause IIS to always start me up in dllhost. I've tried
everything I can think of and nothing works. I'm getting a little desperate
because this is my main development system and I'm not getting my other work
done. Any help greatly appreciated.

Thanks.