It sounds like the old copy of VRS was not completely removed.
Please uninstall VRS using the instructions in the following QAID:http://knowledgebase.kofax.com/faqsearc ... ?QAID=9575
It is important that you follow all the instructions in this knowledgebase article so that all the remnants of the original VRS installation are completely removed.
Then install VRS 4.5 OEM from Fujitsu's website. Test in VRS Test Application to make sure that the OEM license is being applied for your fi-6130.