possible to change from 64-bit to 32-bit OS?

how to do if I wanted to change from 64-bit below to 32-bit OS (i.e. windows 7),possible?

thanks.

see this deal:

http://configure.dell.com/dellstore/config.aspx?c=ca&CS=cabsdt1&l=en&OC=NB_V3550_FT001

Processor Included 2nd generation Intel® Core™ i3-2310M processor 2.10 GHz

Operating System Included Genuine Windows® 7 Professional, XP mode 64-bit, English