As per the screenshot the version of BE is a 64-bit.
Are you installing a x64bit BE on a x86 bit server?
to make sure if its a 32-bit or a 64-bit http://support.microsoft.com/kb/827218
Hope this helps...
The extender that you are using is for 64-bit machines. If you run it on a 32-bit machine, you will get your error message. If your machine is 32-bit, then you need to get the 32-bit version of the extender from Symantec Licencing.