Antivirus programs don't like each other because of the way they scan, and the database they have to keep in order to do that. One AV application may misidentify the other's database as a virus, or they both attempt to scan or insert themselves into the operating system in such a way that neither works right.
I've run CCleaner with Norton, AVG and Macafee - there have been no issues.
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1984 300TD
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