Where has my Parallels 'alias' gone?

I installed Windows 7 in Parallels five and for a couple of days it worked fine. But when I tried to launch it yesterday it said the alias had disappeared and gave me the option to fix it. Clicking this simply brings up a list of files on my computer, but I don't have a clue which one I need! I am in trouble and would be very, very grateful for some kind person to come to my rescue!

Cheers!

Yes, it's a parallels not Windows problem

It's when I try to launch Parallels that the error message occurs. I can find Parallels in my applications folder, but there are several 'parts' of it and none of them are clearly the one I need, so I don't know what I'm looking for!

Thanks,

H.