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Full user review
"Works great but slow in Windows 7 64 bit"
Found Malware that Virus Scan missed.
Sped up system
Slow in Windows 7 64 bit OS in full scan mode.
Program cannot utilize speed of multicore processor
I used this program because it came highly recommended, but it took 4 hours and 29 minutes to do a complete scan my desk top computer with Windows 7 pro and took 1 hour 38 minutes with the lap top with Windows 7 home premium, both are 64 bit systems. The desk top has a terabyte black cavier drive that is 10% full, so I was surprised at how long it took since the desk top is a quad-core processor at 3 Ghz.
With that said, Malwarebytes found 154 Trojans/etc that were slowing dowm the desktop and found 51 on the Lap top. The lap top has been in service only since Dec 2011 or 7 months.
I have yet to scan the netbook, the children use for homework. It has Windows 7 basic. Not sure if it is 64 or 32 bit OS. But the ACER netbook has some quirks in Windows 7 and may not be a fair comparison.