Hecky we all get a bit mad at our computers from time to time. I am running a Win 7 Pro 64 bit machine too. I have an Intel i7 2600K processor, 16 GB of RAM and an XFX Radeon 6970 video card, all this mounted on an ASUS motherboard. I use both SATA 3 and SATA 2 internal drives and also have a Network attached drive and both USB3 and USB2 externals. I use a Wacom Intros 4 tablet and even with all this stuff and many many windows programs, my VNX2 and CNX2 run flawlessly in 64 bit mode. My images open quickly and I like Mik have been pretty much bug free since the 64 bit version came out. Perhaps it is something else on your computer that is conflicting with the Nikon Stuff. The fact that reinstalling seems to have fixed your problem makes that even more of a likelihood. I run Norton for my security system and use Diskeeper as my defragger. I am also using two backup programs Acronis and Retrospect for automatic backups. I also run Photoshop CS6 Extended and the rest of the programs in the CS6 Production Premium Suite. I am running my video card in conjunction with on board graphics using VIRTU that does an auto switch as needed and that usually gives some programs fits and the only program that had a problem with that until I made a simple change was Adobe Premier Pro CS6. If everything else on your computer is working without problem you may want to tell Nikon what you have running and see if they know of any conflicts. While I don't use LR it seems like I have seen some problems posted about it, so just changing SW may not really be a solution either. I hope you figure out what your problem could be.