LOL.... you really asking for trouble. 
x32 stands for 32-bit. Most PCs nowadays are 32-bit, unless you
have bought a brand new one which supports 64-bit.
x64 is rarely compatible with x32 drivers, that's why you run into
problems. (That's as of now. MS might make it compatible with x32,
like how they supported games which run on only x16
platform).
I don't know if Lotus Notes run on x64 machines... check with Lotus
Notes, most likely not, since you ran into trouble with it.