For the last couple months I’ve been troubleshooting a vexing problem on my new quad-core HP desktop: Roughly once per week, the machine would start running as slow as molasses. And I mean slow: ...

A spate of scareware apps that trick users into buying useless hard disk repair tools appears to be part of a concerted campaign to push fake ‘defrag’ software, a security company has said. A spate of ...