What is the difference between 32-bit and 64 bit?

A bit means a binary digit - either 0 or 1. In the old days there was 8 bit, meaning the processor could process 8 bits at a time, so bigger numbers will be split 8 - 8 and processed in a sequence. Then came 16, 32 and now we're entering 64 bit. The processor can handle 64 bits at a time, so the math is faster, more memory can be accessed with even more addressing space etc. Basically 64 bit is fast. But remember 64 bit is backward compatible, so an OS with 64 bit does not guarantee speed. The software or app you run should be 64 bit to get the juice out of CPU!

I did an internet search for it. In brief a 64 bit Operating System can handle more memory, applications etc. Here is the link which will be useful to you. Its a microsoft support link. It should answer all of your doubts. http://windows.microsoft.com/en-us/windows7/32-bit-and-64-bit-Windows-frequently-asked-questions

These refer to memory. You can probably buy a small memory card for a few dollars and put into your computer to add additional radome memory and probably increase your computer speed.