Unwanted websites open

Hello,

I have a small problem with my computer. I have websites like financedtricks.com or financeranger.com open in a new tab from time to time and I can’t find a way to stop them doing this. I installed avast free and performed a full scan. It found some viruses and successfully removed them but the problem is still there. If I make another full scan with avast it tells me that no threats have been found.

I think I got this trough a USB stick from another infected computer.

Help would be appreciated.

Follow this guide and attach the logs from malwarebytes / OTL / aswMBR
http://forum.avast.com/index.php?topic=53253.0

then one of the malware removers will help you when they arrive…may take some hours