I've tried what you said by using the command line version (didn't know about that, thanks for telling me), but now I keep getting the error below...
Decompressing… Done.
Arguments: a -bd -t7z -ms -mmt -m0fb=128 -mx=7 -m0d=202m
26/12/2008 17:26:27 - 402,653,184 bytes in 6 files compressed to…...