Im not sure if I'm the first person to get to this problem but i have just found out that websense will not run on server 2008 32bit infrastructure with ISA or ForeFront TMG. This is how it is:
Websense running on Windows 2003 32bit:
Websense will run fine on Windows 2003 x86 as ISA 2006 will install and run correctly therefore Websense can integrate with ISA - No problems
Websense running on Windows 2008 32bit:
Websense will run fine on Windows 2008 32bit but ISA 2006 will not run correctly as you can only run the management part which looks at another ISA 2006 install on the domain. As for ForeFront TMG, this is only available as a 64bit version
Websense running on Windows 2008 64bit:
Websense will not run on Windows 2008 64bit but ForeFront TMG will only run on this platform.
If i have come at this wrong or anyone knows how to get round this problem and has managed to get Websense running on 2008 with some kind of integration can you let me know.
Thanks
Tim

