If you are not using MS Visual C++ ("MSVC"), then you won't be able to install DBI via the CPAN module, because the DBI has a part that needs to be compiled by a C compiler. I suggest you install the DBI via PPM or whatever module installation method your package supplies.

If you want to install MSVC, please take care of installing exactly the version that was used to compile your Perl executable or recompile Perl with your installed version of MSVC. There are some nodes on using the free Microsoft compiler tools here:

• Free MSVC tools + Activestate to compile CPAN Modules
• Building Perl with the free MSVC tools # propably most of the niggles have been fixed in recent releases of Perl