Kaspersky Internet Security
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Full user review
"Very comprehensive, but sometimes intrusive"
Constantly scanning computer and e-mails received for viruses, etc. Virus definitions are often updated.
The software can and does intrude on currently running programs without warning. When uploading information for their research, my computer is locked up for as much as 5 minutes. During this time the cursor is also frozen.
In general, a very good and comprehensive program. Virus definitions database is frequently updated. It is also easier to use than other programs of this type. The only anoyance I've experienced is having my computer locked up while up-loading research information to their website. This happens without warning and brings whatever you are working on to a screeching halt. Perhaps this kind of information draw could be rescheduled for after work hours.