Grisoft, well known for the AVG Anti-Virus software, purchased Ewido Networks in 2006 and reworked its antispyware technology into Grisoft AVG Antispyware 7.5. The sleek-looking program recognised, on average, the largest percentage of threats. Unfortunately, Grisoft AVG Antispyware 7.5 suffers from poor behaviour-based protection and a high false-positive rate.

  • Operating system tested on: Windows Vista
  • $30 (about £15) for 1-year subscription

During tests Grisoft AVG Antispyware 7.5 proved itself adept at uncovering known adware and spyware. Grisoft AVG Antispyware 7.5 detected 19 of 20 active samples (ones installed on the test PC), missing only the Banbra Trojan horse, which attempts to collect online-banking credentials. Grisoft AVG Antispyware 7.5 was also by far the best at recognising our large stable of inactive adware, keyloggers, bank-related spyware programs and rootkits - a testament to the breadth of its signature database.

But when Grisoft AVG Antispyware 7.5 didn't recognise the threat, its behaviour-based detection failed to flag suspicious additions to HKLM ‘Run' keys, changes to the default Internet Explorer start and search pages, and alterations of our test system's Hosts file. As a result, Grisoft AVG Antispyware 7.5 may allow unknown threats to tamper with key areas of your PC. Grisoft AVG Antispyware 7.5 was also the only product we tested to produce false positives.

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