There could be a few reasons for low virtual memory messages and they can be found at the bottom of
this page. Unfortunately, the suggested cures are only for the brave. The sort of steps that might lead to trouble perhaps.
Regarding MSN, you would have to reinstall the later version again if you did a system restore. Although if the earlier version was working OK perhaps you could just leave it at that. Sometimes, upgrading isn't always necessary and may not even be for the best.
Has the 'GDI+' mentioned in the other thread always been there?