Computer Chess question

Not sure where to post this:

What happens when you play computer chess and

all the computer does is think...is it stuck?

did I finally win?

Will computer stop thinking and make some move?

Has anyone encountered this before?

Has been going on for about 6 minutes.

here are moves so far if that helps in any way:

[Date "2010.11.08"]
[White "Computer - Easy"]
[Black "Player"]
 1. Nf3 Nf6 2. g3 h5 3. d4 Rh6 4. Bxh6 gxh6 5. Nc3 c6 6. e4 Ng4 7. Be2 d6 8. h4 f5 9. exf5 Bxf5 10. a4 Bg7 11. Bd3 d5 12. Bxf5 Qd6 13. Bd3 Qb4 14. Bg6+ Kd7 15. Bxh5 Nf6 16. Ne5+ Kc7 17. O-O Qxb2 18. Nxd5+ cxd5 19. Bf7 Ne4 20. Bxd5 Nc3

Thanks

It happens sometimes -- it's frozen, you'll have to start a new game.

darn...cause I had the queen and bishop and a rook nailed.  wonder if computer

got frozen because I finally did something right?

i love the way you play, very creative play:)

It might be that the computer got to a point within its analysis that make it go into a loop, and that it cannot make a move, because the outcome is dire strait.

i wish i knew how a computer play, sacrificing rooks in early game is good tactic, especially if your window of play is not taking you to the end...but that is your creativity, and a computer lack on understanding.

Thanks for your comments fireballz. 

When you play against the computer in practice games, do these games count in your overall score?  Heck, I lose them.  Perhaps these are not practice games.