Can't find CD/DVD

[Donald4]

Hi

I bought this game yesterday, I installed it, played it, and got the crash at the first portal in the training grounds. I looked over the internet a little, and discovered I needed a patch to fix it. I did go to the official website, downloaded the patch and installed it. I tried to open the game after that, but for some obscure reason he gives this error:
"Wrong disc inserted.
Please insert the CD/DVD."
He does this while the DVD is IN my dvd-driver. It's not a problem with the driver itself cause he recognizes the game (even starts autorun when I take it out the and put it in again), I even reinstalled it and it worked again, but if i install the patch, i get the silly 'wrong disc inserted'... What to do about it?
If someone could help me with this, i would be very grateful

Donald

PS: my dvd is not a copy, it's the original game, bought in the store yesterday...