Hi

Hmm i am not familair with windows but one thing i would try would be backup this 2gb logfile for now.

And then truncate the logfile using something like
type null >listener.log

and then see if you can reproduce the problem and then upload the trace file for analysis

setting up a AT job to do perodic log rotation so that the log file stays within manageable limits is also a good option

regards
Hrishy