Ah, I had the same problem, and sadly enough, there isn't a way to fix it without reinstalling. What happens is, is that since you haven't registered your copy of PS, (Which I'm supposing you haven't, and I'll suppose even further as to say you haven't purchased it, no offense intended, for I haven't either $$) the registration/help window 'pops' up, however, if this popup is blocked, or it simply doesn't open, it overrides all of PS: by which I mean, PS will 'freeze', waiting for you to take action to the popup window. Crazy, no? Hope this helps.
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