Crystal Reports XI R2 Appcrash in Vista but OK in XP

Question

I have a Windows Form VB.NET application using Crystal XI R2 to produce reports. The application works flawlessly on other machines in Windows XP, but as soon as I try to load a report in Vista the program exits with the following message -
Description:
Stopped working
Problem signature:
Problem Event Name: APPCRASH
Application Name: Manufact.exe
Application Version: 1.0.0.0
Application Timestamp: 487ed6c1
Fault Module Name: unknown
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 050e3ed0
OS Version: 6.0.6000.2.0.0.256.6
Locale ID: 3081
This happens (only in Vista) whether the report is sent direct to the printer or to the Crystal Report Viewer and occurs at the crReport.Load (direct print) or New CrystalDecisions.CrystalReports.Engine.ReportDocument (viewer) statements.
Despite having Try/Catch blocks and exception handling in place I get no other error messages apart from the above.
I have downloaded and installed all of the CR XI R2 service packs up to SP4 on the development machine.
I have rebuilt with CrystalReports11_5_NET_2005.msm dated 10/04/2008, re-installed but still doesn't fix problem.
I don't think it is a database issue because rest of program loads and displays data (from SQL Server) fine.

Answer 1

The app loads fine in Vista and the database is accessible.  When a report is sent to the viewer I get the error message immediately after executing 
crReportDocument = New CrystalDecisions.CrystalReports.Engine.ReportDocument
The report viewer screen is visible in the background but no report is visible u2013 just the APPCRASH message.
If the report is sent directly to the printer, the error occurs directly after the statement u2013
CrystalReportsFolder=u201DC:\MANUFACT\REPORTSu201D
CrystalReportsFile=u201D\CUSTOMERINVOICE.RPTu201D
Try
oRpt.Load(CrystalReportsFolder & CrystalReportsFile)
I have checked the directory structure and everything in folder c:\program files\business objects\common\3.5\bin (e.g.crdb_ad0*.dll)  is version 11.5.8.1237 .
All the CrystalDecisions and BusinessObjects  files are in  c:\Program Files\Business Objects\Common\3.5\managed\  and are version 11.5.8.1237  except for CrystalDecisions.CrystalReports.Engine.dll which is in folder c:\Program Files\Business Objects\Common\3.5\managed\dotnet2 -Version 11.5.9708.1237).
Yes I am running VB.Net 2005 with the latest service packs