I have had no real problems with PotCO or Wizard101 with Vista Ultimate 32 bit. I do have a rather high end computer, so that may have helped.
I also have found a safe way to access both these games leaving User Access Control enabled, but without having to "allow" them with the prompt. It is not very difficult to do and if anyone likes I could write up a little tutorial on how to do it.
You might want to check with Matty_D as well. He had issues with crashing for a while and it had something to do with a router I seem to recall. When he had that fixed, he no longer had any crash issues.
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