Low. Fixing is optional.
Kaspersky Internet Security
Kaspersky Anti-Virus
Kaspersky Total Security
Kaspersky PURE
Kaspersky Small Office Security
Cause of the problem can be Malware, pornware, adware, configured browser settings.
Changing your homepage(s) to a site which contains malicious codes can subsequently be used to run malicious codes, which can be used in order to gain control of your system and your personal data.
After the fix is performed, the homepage list in MS Internet Explorer will be cleared (changed to about:blank), you can then reset it. If you have intentionally set the homepage in the MS Internet Explorer settings, then do not perform the fix.
You can roll back to the previous settings.
Knowledge Base Free Tools Internet Security Center