mp3 files exported show a lock sign

when i export a file to mp3
and then go to the file exported,
it shows a small lock on it- so i cannot open it.

also, when i record or play back a file coppied from a cassette, it sounds like a growing noise

please help…

my windows is windows7 and the installation cd says: Ver 47.0A

Will it let you right-click the file > Properties?

Distortion that slowly changes over time could be Windows Enhanced Services, their conferencing suite. You can turn that off.

http://manual.audacityteam.org/help/manual/man/faq_recording.html#enhancements

How do you have the cassette machine connected to the computer? Most people get this wrong because the computer suggests strongly that you just run a wire between the tape player and the computer. It’s usually not so simple.

http://manual.audacityteam.org/help/manual/man/tutorial_copying_tapes_lps_or_minidiscs_to_cd.html

Koz