I do not have an exact answer for you as I have never gotten this error myself. It might be that you have some sort of firewall issue that stops PPM writing to you local drive. You might want to check this.

As well you might want to post this question on

http://groups.google.ca/group/perl.dbi.users?hl=en

you will most likely get an answer as perl.dbi.users is a very active forum.