Here’s the problem – Internet Explorer seems to have decided that the home page About:blank is what will greet you every time you open a new browser window. You try to change it back but either your Internet Options are greyed out or you change the page back, only to find next time you start Internet Explorer the dreaded About:blank has returned.
There are many possible causes for this behaviour and most are evil. One possible cause is a virus, but this is not very common. The most likely culprit is an adware/browser hijack program – in particular, CoolWebSearch.
The symptom that identifies the CoolWebSearch or a close variation is that About:Blank appears as the address, but in the background a window pops up stating that spyware, adware or something similar has been found on your system. CoolWebSearch is a browser hijack program – it takes over your home page, and keeps changing it back. Its purpose is to show you advertising, or flog you an over-priced piece of software to fix the issue CoolWebSearch has created. The About:Blank change is a trick designed to confuse users – regrettably, it is very successful!The simplest way to remove the About:Blank adware is to use a specially designed tool and clean up your system. Step one is to flush out all the temp files on your system: Cookies, Temporary Internet Files and Temp files (you can do this via Internet Explorer's Tools-Internet Options or for a more thorough clean, use a privacy eraser tool. Next up, get a copy of CWShredder. This should kill CoolWebSearch and allow you to change your home page from About:Blank, plus it will kill those pop up windows.
If these options don't work, you may need a more in-depth tool.
The About:Blank deception is devious enough already - it may be altered in the future, so keep an eye out for other programs that contain it (main sources: free programs with adware files) - and stay clear. Finally, consider adding an anti-adware tool to work next to your anti-virus software.