EoRezo is a detection name that is in use for a big part of the adware family called Tuto4PC. The adware is bundled with other software and with tutorials (about software). The adware, although annoying, is usually harmless by itself, but that can’t be said about the advertisements and sites it opens on the victim’s computer.
Systweak’s RegClean Pro is quite a popular software. Top Ten Reviews, a consumer review portal based in Utah, has ranked it as number one in their “Registry Repair Software” category. It also boasts of having won more than a hundred 5-star awards. Yet in spite of these, something is amiss.