Make sure CR 10.2 (bundled with .NET 2005) is uninstalled.
Does the report have any subreports? If so, what section are they in?
As test, I'd like you to download an eval or CR 2011 from here:
http://www.sap.com/solutions/sapbusinessobjects/sme/freetrials/index.epx
Instal the CR 2011 designer and try to run the report there.
- Ludek