Have had this problem for a month. thought I had cured it by uninstalling a particular program and fixed it for 4 weeks but it happened again today. Is there a known cause for this problem. It requires turning off the computer and restarting to fix it. When it was going badly it was happening every 10 minutes but so far only once today. Maybe someone knows. is it possible that some programs are only meant for 64 BIT. I use a 32 bit vista os.
There's not much to go on here.

But anyways, here's some possible solutions (I have no idea what your problem is, saying your keyboard turns off occasionally can have hundreds of causes)
Order : most likely - least likely.
Keyboard Driver ERROR (reinstall your drivers for keyboard If you're USING razer then install razer synapse).
USB driver error (reinstall USB drivers for your motherboard)
Hardware failure (check the wire and make sure it's intact)
OS error (Operating system mistakenly stopping keyboard/human interface service).
Antivirus error ( Same as OS error except with antivirus)

If you want a more in depth answer then I'll need your keyboard model, motherboard model, and version of your keyboard drivers.

As to your other question. YES there are some programs that are meant for 64 bit, but I doubt if they'd cause your keyboard to stop working. 64 bit programs will not run on 32 bit operating systems.

Also try another keyboard and let me know if it's happening with that one too if you have a spare keyboard.have bought a new keyboard. Have only locked up/turned off twice SINCE I uninstalled the program / was happening every hour before that. have advised the program writer who says it is not possible. but certainly getting better performance since uninstalling. I can t tell you anymore. vista 32 bit. program video downloader ultimate uninstalled. new keyboard still happened with new keyboard before uninstalling. but mostly stable now.