EA released the original Command & Conquer free to download to commemorate C&C's 12th anniversary, but if you downloaded it you may have noticed that there was whole section of instructions on how to actually make it work in Windows XP!
To save you the trouble, and fix a major bug, ASM coder VK has released an unofficial patch to the game.
He calls it 1.05, and it makes C&C compatible with Windows XP, as well as fixing a major bug.
Here is VK's changelog for 1.05:
*Command & Conquer now Windows XP compatible!
*You no longer need to set "Windows 95 compatible mode"
*Included updated THIPX32.DLL file, which fix LAN games support.
*Map border crash no longer happen.Visit VK's website to download the C&C 1.05 patchNote that only C&C Gold 1.04 and the TFD version of C&C can be updated to 1.05.