A friend has a Windows 7 Home Premium laptop PC running Internet Explorer. I think the browser has been hijacked as whatever you type into the address bar reverts to ASK and all the links on the page look suspicions. If you type in a website address within a second you get the error message "The page cannot be displayed" and sometimes a box with "script error message" I tried to run Ccleaner from a usb but it just ran for ages without doing anything.
Unfortunately the laptop has been run for sometime without any anti virus which I think probably accounts for the present problems.
I have managed to install a new up to date router without any problems.
I'm just not quite sure what is the best thing to do. I would like to avoid formatting the hard drive if possible and would be grateful for any suggestions as to how to resolve the problem.