Your friend was wrong IMHO. Vista 64 is well supported for drivers on the modern PC (which you have, yes?).
As I and others explained in several other posts, With Vista 32 you will have lost around 3/4 of a GB (if you have a 512MB graphics card). 4GB is better than 3GB because you net out at 1/4GB less at the end of the day with 3GB.
Note that if you upgrade to Vista 64 (didn't you have the disk in the box with your 32bit OS like I did?), then it'll be a fresh install unless you can be bothered to slipstream SP1 into the x64 install files and then perform the install.
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Posting Virtuoso
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since Aug 2007