Help! Sql Server 2005 Kicked My Sql Server 7's You-Know-What

Life is not good.

So I've got a machine that I do some development work on, nothing
major, but I'd like to keep some things intact. I'm running SQL Server
7, it's an old installation, but it works and I've got a number of
databases on it.

So I see the new 2005 Express downloads and I download the Web
Developer edition, install it, it installs 2005, but my SQL Server 7
installation now seems to be hosed.

The SQL Server Service Manager still shows SQL Server 7 starting and
running, but the Enterprise Manager can no longer connect, it gives a
vague "General Error" message even though the sqlservr.exe process is
still running. It was not able to connect upon installing the other
products.

I've de-installed the new Express stuff and now just have my trusty
VS2003 installation. Everything seems fine except nothing can talk to
the database, which makes sense since the database now doesn't even
show up on the Enterprise Manager. The Application node of the Event
Log shows no errors coming from SQLServer. But when I try to connect
or re-register a database I get: "Server registration information
cannot be changed on remote registries"

Nothing like this has even vaguely happened to me before. Is there
anyone with any constructive advice? I'd be grateful.

Peace,
Greg McClure