MediaLab freezing in Vista

Hi,
We are experiencing a problem with our very long MediaLab protocol stopping/freezing suddenly in Vista. From one of the threads on the support page, I can see that others had this problem with earlier versions, and the last post seems to show this problem resolved with v1.33.
We are using 1.33 with Vista and having this problem, though.
For a few reasons, we are reluctant to split up our experiment file.
My question is whether there is a fix for this problem under these conditions with Vista Enterprise, service pack 2 and MediaLab v2008.1.33
and if there is no fix, should we reformat our systems with XP?
Thanks,
Susan