Many of user's actions are registered in the system. The following data are saved:
Histories containing information:
about visited websites
about applications launch
about search requests
about opening / saving files by different applications
Microsoft Windows system log records
Temporary files etc.
Kaspersky Internet Security 2011 (2012) / Kaspersky Anti-Virus 2011 (2012) includes the Privacy Cleaner Wizard. The wizard allows deleting sources of information about the user's activity which may contain confidential data (for example, passwords).