Can not import/generate keys

Hi All,

I have a problem, that on WinXP SP2 I can not generate or import any secret/public key. I generated the keys on other computer and now I want to import on other computer. When I choose to import, the program is not importing any key, without error message.
Normally I can only partly generate a new key - after generating a public/secret key, the program fails with the error message: General error happened.
What is there a problem ? I am using the newest GPG4win which I downloaded.