Sorry guys,
the 4-GB-Patch will run with 32 bit OS too (if you have 4 GB RAM)!. You just have to do a little additional work: you must increase your userva via bcdedit order.
For details see this
old post by Krabb who gave us this solution - i'm still using it that way on my old VISTA/32 - 4 GB RAM - Notebook.
Greetings
rowi58