You have the Slotch hijacker and is old hat now.
Before running any of the below,you need to uninstall any of the following from add and remove programs;
(if they exist)
Software Update Manager
Uninstall 180 Search Assistant (You must be connected to the internet. Just keep pressing the uninstall button when it prompts).
Viewpoint Media Player
Download and update Malwarebytes free click here now boot the computer into safemode and run Malwarebytes.
If this fails try Spybot Search and Destroy click here again download and update / immunise and again run in safemode.
Failing these,follow these instructions for a manual removal. click here