|MS say it is incompatible with Win 7 but some users have it running fine. |
[Similarly I'm running Office 2003 on Win 8.1 with no issues at all despite it being claimed as incompatible].
It might be a matter of the program mix on your computer and/or MS not wanting you to use it or making any attempt to support it. So you are on your own.
My best guess is that it is most likely to run well on a 32 bit machine (if that's what you have). More debateable on a 64 bit, although it least one person seems to have done it.
In summary it is a matter of suck it and see - nobody can be 100%.
Always pop back and let us know the outcome - thanks