That happened to me when I had a subreport that was wider than the main report. Go back into your VS, layout mode, and check all your report objects. You'll probably have to scooch them to the left or shorten them on the right side. Also, you'll have to narrow down the body of your report.
If your objects are marked "Can expand with contents" (or whatever the wording is) and your report body is larger than you realized, you need to scroll to the far right, hover the cursor over the right edge of the report until you get the little size handle icon, then click and drag to the left. Watch the ruler bar up top. It'll tell you how wide the report is actually trying to be.
Hope that helps!
Catadmin - MCDBA, MCSA
"If a person is Microsoft Certified, does that mean that Microsoft pays the bills for the funny white jackets that tie in the back???