Like you I liked the 32 bit version so much I tried the 64 bit.
No problem installing, but having persevered for a week I found it so flaky and unstable that I have now uninstalled it and gone back to the 32 bit version.
Can't help with your particular problem, but perhaps the 64 bit version is not quite as ready for release as the 32.
Should I upgrade to Windows 10? 8 reasons why you should upgrade to Windows 10... and 2 why you…