It's quite easy, but not easy to explain.
If you search the forum for words like "revert version", you'll find a post like this: http://forums.adobe.com/message/4489247#4489247, which may be enough for you to work it out yourself. Otherwise, you're knackered, as we say around here—there's no straightforward method.
Thanks, will see if I can figue it out. Probably 7.4 will come along and solve my problem.
7.4 is available now, Update using Help>Updates...
Thanks for the reply. I have already downloaded 7.4 and it seems to be working perfectly.