I don't have access to Access anymore myself, but, I'll bet someone here would know: http://forums.augi.com/forumdisplay.php?118-AutoCAD-Customization There's some good programmers there always ready with advice.
What version of Autocad and what version of Windows? I believe that was a known problem with XPSP1, but, maybe it was fixed with SP2? I'm not certain. Narrowing down the releases involved could help suss out the solution.
Technically 2014 was the last version of AutoCAD to support XP...
Some people are running it on XP though... including the Author of Mastering AutoCAD 2016, George Omura, so it must be possible.