Do not know if it is, what you want to do, mby you want to run it in 64bit.
But if it does not want to run, just set the compatibility, to test that everything else is running.
Hope this helps out a bit.
You could email the bitcoin-qt staff to make 64-bits version, if there is not already one made
If you guys even bothered to read through the entire thread (I'm being hypocritical because I didn't do that), you would have discovered that OP left BitcoinTalk a while ago
And since his post, a 64-bit version of Bitcoin Core has been made.
You guys living under a rock or something?