I think it might be good to ask for language version as well in the "problems with a guest" -> "guest operating system" question, since sometimes there are problems specific to non-english versions of Windows. Something like "Guest operating system (including language, e.g. Windows XP Pro ENG, Ubuntu 7.04)". It may however clutter the answer a bit (only negative I can think of). Including an example with non-english version of OS might do the job alone (i.e. "Guest operating system (e.g. Windows XP Pro German, Ubuntu 7.04)")

Also explicitly asking for info about 64-bit could make sense.

In both properties (language, 32/64 bit) it could make sense to allow for the default ones (ENG, 32-bit) to be implicit (i.e. when someone does not mention info about language, the default variant is assumed), but could also make it hard to distinguish whether the "asker" simply forgot to include the info and is using the non-default variant, or whether they really do use the implicit variant.

These are just thoughts, maybe I am just making much a do about nothing - let me know what you think.