system
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I have Windows XP SP2 on a Pentium IV 3.19 Mhz with 250 GB drive and 1 GB RAM and 400,000 plus files (25 GB worth of files) and it takes about an hour and a half to two hours to scan that lot with Thorough scan selected and archives checked.
Yes it’s slow but better safe than sorry:) and that is a serious amount of data which I do back up regularly.