Ok, try to uninstall the program, go into your drive where you installed it to, delete the folder there, then go to Start -> Run. Type in regedit and press Ctrl F. Type in Guild and do a search.
Whenever something Guild Wars related comes up, deleted only the registrey files, not the folder they are in. (You might delete something important that way.) Use your best judgement when it comes to deleting files while using regedit, deleting the wrong one could cause computer problems.
This is the best way to clean sweep your computer of any GW files. Try to reinstall the game after your done deleting, and see how it installs this time around. If it doesn't ask for CD two, try putting it in anyway just to see what kind of message it gives you.
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