I rolled back the following from 10.9.2 to my 10.9.3 install.
drwxr-xr-x 3 root wheel 102 Sep 29 23:03 NVDAGF100Hal.kext
drwxr-xr-x 3 root wheel 102 Sep 29 23:03 NVDAGK100Hal.kext
drwxr-xr-x 3 root wheel 102 Oct 1 22:03 NVDANV50HalTesla.kext
drwxr-xr-x 3 root wheel 102 Sep 29 23:03 NVDAResman.kext
drwxr-xr-x 3 root wheel 102 Oct 1 22:03 NVDAResmanTesla.kext
drwxr-xr-x 3 root wheel 102 Sep 29 23:03 NVDAStartup.kext
drwxr-xr-x 3 root wheel 102 Sep 29 22:35 NVSMU.kextAll it does it cause an instant reboot.I am guessing I am just going to do a full re-install and this time setup time machine for such cases as this.Unless someone else has a better idea quick
NVSMU has nothing to do with NVIDIA graphics - it's a driver for the NVIDIA MCP79 and MCP89 chipset co-processor. Note I said NVDA* kexts, not NV* kexts. If you're actually using it for your board, then bring back the original from 10.9.3, though to be honest I would be surprised if you do use one of those chipsets, it would cause a reboot by using the 10.9.2 version. I don't have a motherboard that uses it so I wouldn't know its effects of rolling it back. If you don't have either of those chipsets then hell, you could delete that kext and it wouldn't make a difference. A simple kextstat command will tell you if you're using it. What are the specs for your motherboard or laptop?
Now let's say you don't actually use that kext at all - I'm skeptical that rolling back graphics drivers would cause an instareboot at the moment you boot the kernel (I assume that's what you mean) instead of a kernel panic - that's usually kernel and/or bootloader related regarding your CPU's support, but I wouldn't be too surprised as I've seen stranger things happen.