Paul: Ouch I'm sorry. I've seen this problem before and am 100% sure of the problem. Your PATH is too long, seriously. When you open a cmd window, some of those entries are being ignored.
http://superuser.com/questions/63508...-path-variable
You can copy your existing path to a text file, delete a bunch of entries. Add sliksvn and fpc.2.6.4 to the front. Type "fpc -iV" and see if "2.6.4" is returned. the proceed as normal. When done, re-edit your path, but I'd consider making different command prompt shortcuts with different path variables to reduce the size permanently.
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