@Pelego96
Try these then:

https://support.steampowered.com/kb_article.php?ref=5848-YWRM-8664
http://gaming.stackexchange.com/questions/183755/my-mouse-doesnt-show-up-when-i-play-games
http://gaming.stackexchange.com/questions/51351/mouse-cursor-wont-display-in-full-screen-games
http://www.makeuseof.com/answers/mouse-invisible-play-games-full-screen-mode/

The id and password aren't necessary :)

That did it! I was not looking in the right place in the registry, it turns out. I was then able to return the game to a usable resolution. Funny thing, though - the "Lock Resolution" button doesn't stay unchecked...??? No problems now though. I was in the middle of a hot and heavy round of "Behind Enemy Lines" and restored my saves and now am able to resume hostilities. Thanks a million for the advice! And now there's a forum post people can refer back to in same situation. LOVE machines - LOVE this forum!!!

wH

@Encrypted
Now it's my turn... yay.gorilla! Hahaha I'm glad it worked =)

@Lee123
Music never works for me unless I have a physical disc 1 sitting in my disk drive.