There are a couple things you can try. With Office 2007, you can
install the free Microsoft Export as PDF add-in:
http://www.microsoft.com/downloads/details.aspx?FamilyId=F1FC413C-6D89-4F15-991B-63B07BA5F2E5&displaylang=en
After you install that, go to CenoPDF > Options dialog. You will see
the checkbox "Use Microsoft Export as PDF add-in if it is installed in
Office 2007" is enabled. This option allows you to choose between two
different PDF engines. Depending on which one you choose, you can go
to "Compression" tab to set the compression level or go to "Microsoft
Export as PDF" tab to set the Threshold resolution for your images.
See this online help page for more information:
http://www.lystech.com/webhelp/Content/options.htm
Usually "Microsoft Export as PDF" gives you better result. If none of
the settings work for you, please email your file to our support and
we will have a look for you.
Thanks,
-- CenoPDF Support
http://www.lystech.com/contact.aspx