Problems converting Powerpoint/Excel to PDF

Hi,

I have been having problems with how lines in excel come out when printing using Adobe PDF or PDF Creator.  In both cases the thickness of lines, while consistent in excel, comes out completely random in PDF.  My PDFs go to clients and appearances are very important.  The most common way for me to prepare reports is to to paste Excel spreadsheets into PowerPoint as links, adjust the size of the spreadsheet to fit the slide and print, and PDF Powerpoint document.  I am using Office 2010, and Adobe Acrobat X.

Any thoughts would be greatly appreciated!

Thanks,

Kiki