Could you post your *entire* code? The code you replies with earlier cannot be all of it; the error message includes a HTTP header, so you're probably using some other modules, one of which may be causing your DBI not to load. Also, please add use strict and use warnings to your code, and post the error messages again. They may be give a more precise indication of the problem...
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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Want more info? How to link
or How to display code and escape characters
are good places to start.