This article is somewhat out of date but details an issue that needs fixing: http://support.citrix.com/article/CTX103349
I think the safest option would definately be to reinstall. Ideally you'd uninstall
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How to install and configure Citrix XenApp 6.5 - Part 1. In this video tutorial we have explained step by step installation of Citrix XenApp 6.5 Server on Windows Server 2008 R2 is explained in this video.
We have explained the difference between…