Scan with hijackthis and tick the boxes next to all the following entries, then close all browser and explorer windows, and hit the "Fix checked" button.
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://red.clientapps.yahoo.com/cus...rch/search.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://red.clientapps.yahoo.com/cus...rch/search.html
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://red.clientapps.yahoo.com/cus...//www.yahoo.com
O1 - Hosts: 70.84.92.114 ultimaro.com
O1 - Hosts: 70.84.92.114 noobwars.gr
O1 - Hosts: 70.84.92.114 l2.noobwars.gr
O1 - Hosts: 70.84.92.114 forsakenl2.game-host.org
O1 - Hosts: 70.84.92.114 game-host.org
O1 - Hosts: 70.84.92.114 l2.gamersx.com.ar
O1 - Hosts: 70.84.92.114 gamersx.com.ar
O1 - Hosts: 70.84.92.114 gamersx.com
O1 - Hosts: 70.84.92.114 l2.icn.lt
O1 - Hosts: 70.84.92.114 icn.lt
O1 - Hosts: 70.84.92.114 katsu.no-ip.org
O1 - Hosts: 70.84.92.114 no-ip.org
O1 - Hosts: 70.84.92.114 la2.arax.md
O1 - Hosts: 70.84.92.114 arax.md
O1 - Hosts: 70.84.92.114 rofal2.lostomega.net
O1 - Hosts: 70.84.92.114 lostomega.net
O1 - Hosts: 70.84.92.114 lineage2.lt
O1 - Hosts: 70.84.92.114 q-ro.net
O1 - Hosts: 70.84.92.114 runnybunny.net
O1 - Hosts: 70.84.92.114 fuckingyu.com
O1 - Hosts: 70.84.92.114 myfriendsro.com
O1 - Hosts: 70.84.92.114 meukro.com
O1 - Hosts: 70.84.92.114 arcticsilverfox.com
O1 - Hosts: 70.84.92.114 brightro.com
O1 - Hosts: 70.84.92.114 undercovergames.net
O1 - Hosts: 70.84.92.114 projectro.com
O1 - Hosts: 70.84.92.114 rusro.ru
O1 - Hosts: 70.84.92.114 viral.no-ip.com
O1 - Hosts: 70.84.92.114 no-ip.com
O1 - Hosts: 70.84.92.114 sero2k.myftp.biz
O1 - Hosts: 70.84.92.114 myftp.biz
O4 - Startup: PowerReg Scheduler.exe
Reboot when done and post another log please.