Have you downloaded any extension or toolbar for your browser recently? Change of homepage usually occurs when you download or add a new extension or toolbar to your browser.
While some toolbars and extensions are harmless to your system, many others like Ask.com are classified as potentially harmful. They may not just degrade the performance of your system but also hack the confidential data within. Hence, you must get rid of them at the earliest.
We can suggest you specific solutions if you share with us the name of the browser you are using and the homepage that is coming up.
In the meanwhile, we recommend you to update your security software and scan your system thoroughly to know if it is infected by any kind of malware.
GuruAid.com
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