A colleague of mine has produced various reports in SSRS. We have 2 machines in the office that are failing to load the report via Internet Explorer 8. Both machines are ret
Are you using SQL Server 2005?
If so make sure you have all of these installed on your server hosting reporting services. (Also if you ever happen to have a website with a .NET reportviewer control in it it will need these patches as well) Link Also make sure all the normal security patches are applied to your SQL server namely this one. Link and this one. Link
This may fix your problem outright. There have been all kinds of updates to the Report Viewer 2005 Service Pack 1 Redistributable Package that have fixed a few wonky bugs I have come across.
IE Bug, typically not fixed on Windows XP
Discussed here: http://social.msdn.microsoft.com/Forums/en/sharepoint2010general/thread/a32b665a-916a-43af-862b-2205f8efe083
Indicated it is fixed here: http://support.microsoft.com/kb/980182