Are you annoyed by Portaldosites.com? Do you want to know what exactly it is and how harmful it is to your computer? Answers are here in this passage. Similar to Start.sweetpacks.com virus and Delta-search.com virus, Portaldosites.com is a malicious browser redirect threat which gets inside your system together with other viruses. After infection, Portaldosites.com will alter your browser settings, homepage and change your desired links to Portaldosites.com or other advertisement websites. Besides, it can block the normal processes of programs, run numerous spyware in background and install useless browser toolbars. And all of these humful functions will make your computer act dramatically slow and often occur blue screen or freeze sometimes. Moreover, since Portaldosites.com redirect virus usually uses rootkit tactics to hide its presence, the Windows firewall or legal anti-virus software can not detect it easily, not to mention remove it clearly. As a result, we recommend you to follow the removal guide below and remove Portaldosites.com as soon as possible when you find it in your browser.