Mac keeps freezing after i open iMessage.

Hi,
Ive recently installed the latest up date for OS X Yosemite. Since i have updated it, every time i go to open iMessage it takes forever to open and then it freezes my mac. It has also slowed my mac down a lot. My mac is only a couple months old.
I was just wondering if anyone knew how to fix this and also if anyone has had the same problem.
Cheers,
Buster2111

Remove "Kaspersky Security," if it's installed, by following the instructions on this page. If you have a different version of the product, the procedure may be different. The product includes a Safari extension that may not be removed by the uninstaller.
Back up all data before making any changes.

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