I recently purchased a new laptop and found out it has AMD64 architecture but was only installed with a 32 bit version of Vista (Home Premium). I was wondering what the advantages/disadvantages (if any) would be if I were to upgrade to a 64 bit edition of Vista? That and if my computer can adequately run it of course.

I have a HP Pavilion dv2845se

2.1GHz AMD Turion(TM) 64 X2
3.4gb of RAM

If any could help I would be much appreciative