Which MAME To use for WIndows 7 - 64 bit?

Which MAME do you guys use for Windows 7 - 64 bit? Having some problems..

You can use either the 32 bit or 64 bit build. Both work without any issues.

Great, this UI Browser is opening fine.

Where can I get a nice ROM Package from that would fit the MameUI64? Demonoid has alot but most of them are not working n'sync with this, I found one for version 0.142 but it is 166 GB's whereas the others are alot less.

Rom requests and links breach this sites AUP. Modern Mame rom sets are huge, if you don't want such a large file you'll need to use an older version of the emulator and source an older romset that works with it.

Of course you could just download the games you want to play as you want to play them, keeping your romset size minimal.