To remove the about:blank virus that modifies the home page settings, restore your Web browser to the default settings via the Internet Options dialog box. After that, download an anti-malware utility, such as Malwarebytes Anti-Malware, and remove the cause of the problem after performing a threat scan.
Start Internet Explorer, click on the gear icon in the upper-right corner, and select Internet Options from the drop-down menu. Once the Internet Options dialog box appears, click on the Advanced tab, and select Reset. When the warning screen appears, check the box next to the Delete Personal Settings option, and select Reset. After the reset process completes, click on Close, and restart Internet explorer. Other popular browsers, including Firefox and Google Chrome, require the same process to get rid of the symptoms of the about:blank virus.
To remove the cause of the problem, go to Malwarebytes.org, and download the free version of the utility. After installing it, update its malware database, and perform a scan by clicking the Scan Now button. Wait for the scanning process to complete, select the Quarantine option next to the detected threats related to the about:blank virus, and click on Apply Actions. If a dialog box instructs you to restart your computer, click Yes. Once the computer reboots, the threat should be removed.