|A GPU is a GPU, there is no 32-bit or 64-bit. The memory used on the video card can be 32-bit, 64-bit, 128-bit, 256-bit, etc, but that has nothing to do with the GPU. If you have a video card that uses 32-bit memory, it must be extremely old.|
Post your complete system specs including the make/model of your video card. The logon problem you mentioned has nothing to do with the graphics.