Can I install 64-bit OS on my Dell Inspiron 1545 laptop?

Can I install 64-bit OS on my Dell Inspiron 1545 laptop? My Dell Inspiron 1545 laptop features the Intel Pentium Dual Core T4200 processor. When I bought it, it came preinstalled with Windows Vista Home Basic, 32-bit. I'm considering upgrading it to Windows 7 Home Premium, but I don't know whether I should order the 64-bit or 32-bit version. The information I found on the web has been confusing.
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Guest [Entry]

Before spending the money for a 64 bit OS, you may wish to make sure that the rest of the chipset can take advantage of the extra address space. I was very disappointed to find out that, even with a 64 bit OS on a Dell D820, I could still only access a maximum of 3.2 GB of RAM.

Guest [Entry]

"The Pentium 4 Dual Core T4200 has a 64-bit instruction set alright, but this is not the only criterion. I recommend to use the Windows 7 Upgrade Advisor.

The program will tell you if your system is suitable for 64-bit Windows."