necrovision, insert original CD after installing patch 1.1

[chris61991]

I was playing the game but got stuck on chapter 3 in the hill. I visited the forum, I saw there was a 1.1 patch, downloaded it and applied it to the retail load of the game, and then went to play about a half hour later. In other words, the game had been running just a half hour before.

Now I get a securom message telling me the wrong disc is inserted and to insert the original disc, but there is only one disc for Necrovision and it is inserted in the same drive it was a half hour ago. I've restarted the computer and tried ejecting the DVD-ROM and re-inserting it but no change.