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If you followed all the instruction in that sticky thread, then all you have to do is insert the CD in the drive. Same as you originally did to install it.
That is a different problem and has to do with a bad disk, possibly dirty or dammaged.
Try cleaning it with some glass cleaner and a lint free cloth.
If that does not work try copying the whole cd to the Hard drive and install from there.
Could be.
Pretty easy to install the latest version.
Also make sure your windows is up to date.
There are instructions for manually uninstalling the game in a sticky thread on the subject at the top of this forum.