Possible Conflict???

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If I install Spyware Doctor on my computer that already has McAfee Internet
Security 2009 installed, will I have a conflict problem, i.e., can they
co-exist without messing up my computer.  I'm not sure McAfee does a good
job on Spyware so I'm thinking Spyware Doctor may be a good addition if
there will be no conflict.
PS - I assume I should disable pertinent parts of McAfee Internet Security
while installing Spyware Doctor (by PC Tools).

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