#1) Turn off Anti-Virus when installing game.
#2) go back to Game folder and Right click on the game folder and select Properties, Uncheck Read Only, then click on Security tab.. Click Edit button and for each user, system, installer, etc.. (have to do 1 at a time) put check mark into Full Access and click OK, Click OK and when the prompt comes up say All Files and Folders and Click OK again.
#3) Turn off Anti-Virus when Patching game.. If for SFC II EAW, make sure to DL and install the mission fix for Met_7 Script.. the one from patch 2.3.3.6 is bugged. also install the Dynaverse Fix as well (also Firesoul's game fix for the ESG and missing fighter fix).
#4) Do not use the shortcut the game installs to launch game, go into the game directory and find Starfleet.exe or Starfleet OP.exe and right click, select Copy.. go to desktop, right click, and select Paste Shortcut, Right click on Shortcut and Click Compatibility Tab and put checkmark into Run As Administrator and click OK.