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There has been a movement towards faster, less intrusive internet security suites in the diverse range of 2009 offerings. Physical installation of Trend Micro Internet Security 2009 is certainly fast, although several update and registration steps are slower.
The suite requires 100MB of disk space, more than stand-alone antivirus, which Trend Micro does not recommend you buy.
This is the slowest stage of the installation, which in all takes several minutes.