X-COM UFO Defense graphics problem

I downloaded the gold version of X-COM UFO Defense (is this the same as the CE version?) but whenever I play it the graphics appear incorrectly. From what I've read graphical problems are fairly common when running this game on XP until you get one of a variety of programs to fix it, but none of the problems described by other people seem to match mine. When I run the game parts of the screen will appear shifted to the left by about a quarter of the screen's width, whereas the other graphical problems I've read about involve the entire screen being scrambled and unreadable. Unfortunately when I try to get a screenshot the resultant picture is black with a colour-inverted pointer. There's no problem with the sound and no other problems with the graphics.

I already have patch.dll, xcom1fix.exe and ldr_XCOM1.exe but none of them solve this problem. I've also tried disabling directdraw acceleration and changing the hardware acceleration but neither of these actions helps with the problem either. If it's important, whenever I try to load xcom1fix using ldr_XCOM1 I get the following error message: 'Couldn't read process memory'. When I load the normal .exe with the loader it runs fine but I still get this problem.

Are there any other programs or actions that can fix this?