URGENT: imported Studio package disapppeared

I need urgent help: when I tried to continue my translation from an imported package, the whole package had disappeared. (Incidentally, some files that I deleted from the projects view had reappeared.) When I tried to reimport, the program said that I have already imported the package. I'm afraid that if I reimport I will use everything I have translated so far (40% of more than 4000 words).

The program is Trados 2011 and my OS is Windows 7.

I would appreciate any help.

Regards,

Suvi