C SIZE DRAWING MARGINS creo 9

It looks like someone positioned the border at the 0,0 corner of the drawing instead of shifting it up by however much border they wanted.  Easy way to tell is to turn on the grid display and look at where the origin is at.  More than likely this is set in the drawing format and will need to be adjusted there.  If you're willing to upload your C size format as an attachment (zipped), I can take a look.

I'm assuming this is the exported file (shown in your image). Could you also send a snapshot of the same drawing within Creo? There are a number of reasons this could be happening and it may take some Q&A before we zero in on the root cause. Some things I would want to check (I'm sure you have done most of these, just asking to make sure all possibilities are covered):

1. Format size - Is this a standard imperial C-size (17" x 22") with 1/2" margins?
2. Is the "zero point" (0,0) location for the format set properly at the edge of the format or is it possibly at the inner edge of the 1/2" margin frame? (Hard to explain but hopefully you understand what I mean).
3. What type of export are you attempting - or are all of them experiencing the same issue? For example, exporting to PDF versus printing directly to a printer. Are any of them working properly? Also... what steps are you using to produce your output. There are about 3 ways to print a PDF and sometimes the output differs.
4. There are a host of output settings which attempt to tweak, adjust, or modify the PDF output (margins, slew, pen, offsets, labels). There are quite a few of these options which can sometimes affect your output. Do you happen to know if any of these are being tweaked or set? 
5. Do you have a PCF file (printer configuration file) set up for the export/printer you're attempting to use? If so, please post it so we can have a look at it.
6. If you perform a manual Preview of the export, does it display correctly. For example, if you select File->Print->Preview, does the output look correct?
7. Do you have the print settings adjusted to generate a "Full Plot" and are the X-Offset and Y-Offset values are set to 0? 

For PDF's specifically, the problem can occur in several areas. Knocking out the easy possibilities is the best way to focus in on the actual cause. Any other information you can provide will help diagnose the issue.

Thank you!