Moved to Malware Discussion > Home User Assistance as a more appropriate spot.
Please advise what is your operating system and service pack and what version of Internet Explorer is installed, whether or not it is your default browser.
Boot into 'Safe Mode with Networking' by tapping F8 repeatedly while booting up and select that from the ensuing menu, it's usually the second item.
There is one anti-malware software that will not only download and install in this mode but you can also update it (very important before using) and run a full scan with it...all in that mode.
Pick the FREE version ONLY: http://www.malwarebytes.org/products/malwarebytes_free
There are several tools listed on this page along with some suggestions regarding malware attacks: https://community.mcafee.com/docs/DOC-2168