Sorry for the necrobump.
I've been trying the wonderful suggestions in this thread in all sorts of combinations to get C&C Generals and ZH working, and I fear I may have screwed things up even worse. Background: Running Windows 7, 64 bit, legitimate physical copy of C&C: The First Decade. Tried compatibility, fresh install, disable visual themes, disable UAC, run as admin, .ini file, official patch, etc.
Right now when I try to run either one, I get the error about inserting the correct DVD-ROM.
I tried to install this patch: http://www.cncnz.com/hosted-projects/command-patch/the-first-decade-unofficial-patch/
But it quickly stops, saying it has not been totally installed because "Command & Conquer Red Alert\Manual.pdf: This file contains invalid data (error 21FC)." I looked in that directory and that file wasn't even there, so I downloaded what I assume is the referenced Red Alert manual, renamed it, and put it in the folder. I still get the exact same error.
Now when I try to uninstall any of the C&C games, there's an error that wasn't happening a few hours ago:
Error Code: -5006 : 0x800700b7 Error Information: >SetupDLL\SetupDLL.cpp (1194) PAPP:Command & Conquer The First Decade PVENDOR:Electronic Arts (http://www.EAGames.com/) PGUID:66D6F3BD-CA23-41A4-9FA3-96B26B32528C $22.214.171.124844 @Windows XP Service Pack 1 (7601) BT_OTHER 0.0
Please help! I am at my wit's end, and medical school restarts in 6 days when I won't have time
Thank you so much.