rive0108

Well I hope you are running some kind of antimalware program. Russia is a hotspot for malware, and You are probably infected with trojan downloaders (Amongst other nasties) If the toolbar just "popped" up in your browser on its own, and is "redirecting" or preventing access to igoogle, msn, and yahoo sites.
Either way, For a Trojan/BHO to install it would have had to been allowed through UAC.- once that happens it will download/run other malware silently in the background without further user intervention. The most common ways these kinds of "programs" pass UAC is when they are bundled with fake codecs (porn), shareware, freeware, or peer to peer (torrents) downloads.

Try System Restore to undo the BHO.