Hard.

Find Duplicate Files
Free - Find Duplicate Files

It's easy to amass multiple copies of the same file by downloading them twice or copying them into new locations without deleting the originals.

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Cracklock
Free - William Blum

Cracklock is the leader in the hard task of repairing a bug present in a growing number of sharewares and exploited by a polymorph virus known as the "30th day" virus. As its name implies, the virus manifests itself only once you have run the infected software for a certain period of time; usually 30 days suffice to trigger it. To protect these buggy sharewares from this virus, Cracklock uses techniques that other anti-virus vendors such as McAfe

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EAZ-FIX Professional
Free - EAZ SOLUTION, INC.

EAZ-FIX is a PC rollback software. It takes snapshots of computer hard drives IN SECONDS. Each snapshot contains 100% of system, data, programs and settings and Windows registry - exactly what you see at the time of the snapshot. You can recover files from snapshots or rollback the entire system to a snapshot IN SECONDS. You can even restore snapshots when Windows OS fails to boot.EAZ-FIX is the total solution for PC protection.

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