I believe this is a known issue due to 32 bit wrapper can't work with 64 bit java, please take a related discussion and jira ticket to track this issue.
What's exact FUSE ESB version you're using? Later FUSE ESB version already have this fix.
Yeah 64bit windows wrapper is not free from Tankuri.
I think Hiram mentioned that they use a different service wrapper for Apache Apollo project that is free for any OS and 32 or 64bit.