Thanks, part of this is becoming clearer now. So basically, am I correct in stating that if one wanted to update their ROMs to work with the latest version of MAME, they would need to find each of them on the web somewhere and put them in their Mame32/roms directory with all the other ones they already had. They could then run CLRMamePro (either using downloaded datfiles or use a datfile exported from Mame) to scan all the ROMS for errors and possibly fix them as well.
And if all the above is true, CLRMAMEPro could be used to determine which ROMs are missing so one would know beforehand which ones to look for.
Does all this sound right? Can the newer ROMS just be put in the mame/roms directory or should CLRMamepro do something with them first. If so, is this where the rebuilder function comes in.
Sorry for all the questions but I wish there was an easy to follow tutorial for doing this (but maybe for legal reasons noone wants to write this or post it).

Thank you,
Darren