Sounds like someone has compromised your computer ... Use a known "Clean" computer to change ALL your passwords! Do Not use the infected computer.
Let's flush the DNS cache and restore MS's Hosts file.
Copy and paste these lines in Note pad. @Echo on pushd\windows\system32\drivers\etc attrib -h -s -r hosts echo 127.0.0.1 localhost>HOSTS attrib +r +h +s hosts popd ipconfig /release ipconfig /renew ipconfig /flushdns netsh winsock reset all netsh int ip reset all shutdown -r -t 1 del %0
Save as flush.bat
to your desktop.
Double click on the flush.bat file to run it.Vista and Windows 7... right click the .bat file and choose to run as Administrator. Your computer will reboot itself.
Now, download (free version) Malwarebytes' Anti-Malware to your desktop Malwarebytes Anti-Malware Download
* Double-click mbam-setup.exe and follow the prompts to install the program.Right click to run as Administrator, using Windows 7 or Vista.
* At the end, be sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
* If an update is found, it will download and install the latest version.
* Once the program has loaded, select Perform full scan, then click Scan.
* When the scan is complete, click OK, then Show Results to view the results. * Be sure that everything is checked, and click Remove Selected
* When completed, a log will open in Notepad. Please save it to a convenient location. Copy and Paste that log into your next reply.