Install error: cannot modify header info — headers already sent

I’m setting up 2.7.1 on a new server, preparing to import the old blog from another server. I’m using the same code — I just pointed Dreamweaver at the new server and told it to upload. I obviously edited the wp-config.php to have the new database name and all that.

When I run install.php, I get this error at the top of the screen, although it has below that the “Welcome to the famous 5 minute…” message, and the usual prompt for Blog Title and Email.

The error is:

Warning: Cannot modify header information – headers already sent by (output started at /home/gpstrac/public_html/wp-config.php:153) in /home/gpstrac/public_html/wp-admin/install.php on line 36

Line 36 is the body of the function display_header().

Should I just ignore this, or is it a symptom of a deeper issue? This installation is for a high-traffic blog (600K page views per month), so I don’t want to start out with problems.

Thanks for any help!