error while decrypting message: trustdb.gpg

[Fred Bowman]

Hi there.

I decided to create a CD-Rom with my personal keys and the GPG software 
  to be able to work with GPG during my travels without installing 
anything on foreign hosts.

The CD contains:
GnuPG v1.0.6 (MingW32)
secring.gpg
pubring.gpg
trustdb.gpg
random_seed

Whenever I try to decrypt or encrypt a message, gpg stops with an error:

-----> snip
gpg: fatal: g:/keys/trustdb.gpg: can't open: Permission denied
secmem usage: 2176/3296 bytes in 5/8 blocks of pool 3904/16384
<----- snap

while g: is the CD-Rom.
Any suggestions?

System: GnuPG v.1.0.6 on Win2k

--
Kind regards,
Fred