32 bit and 64 bit PC's    
32 bit and 64 bit refers to the number of binary (eg 0 or 1) digits used to store a simple number in a computer chip.

Before Windows 7, most PC's were 32 bit.

You can run 32 bit programs on 64 bit PC's, but not vice versa.

All of VT's applications run on both 32 bit and 64 bit PC's.
VT Software>Topics>System requirements>VT Final Accounts and VT Transaction+ etc>32 bit and 64 bit PC's