x6 32 bit or 64 bit ???

Hi all.  I haven't been around much since the sign shop closed last october.  I do have a bit of freelance work now and then.  I purchased a new lap top in the spring.  Haven't really used it because I am intimidated by Windows 8.  But my husband just got laid off so now I REALLY need freelance work.  I want to get coreldraw x6 but I don't know how to know 32bit or 64 bit because I am totally clueless to what that even means.  i now have x4.  I had x5 briefly at the sign shop but absolutely hated it.  I think i read somewhere that on my new computer i can't use x4.  Any help greatly appreciated.

THANKS in advance

Lisa