Error "no writable public keyring found: eof"

[Holger Koetzle]

Hello,

I just installed GnuGP. When generating my keys I get the following 
message:
gpg: no writable public keyring found: eof
Key generation failed: eof
gpg: can't create `e:/programme/GnuPG\random_seed': No such file or 
directory

Does anybody know what the problem is?
I use gpg 1.2.4 (Windows version)

   Holger