Kaspersky Internet Security v.7

After installing Kaspersky Interenet Security your computer may slow down for many reasons.
Some reasons would be the amount of RAM(Random Accessible Memory) that your computer has, if this is low the computer becomes slowed down as a large amount of that memory is taken away to maintain the security software and keep it you're computer at a high protection rate.

Kaspersky is the reason your computer has become slowed down. You can either un-install Kaspersky Internet Security or buy more RAM for your computer and get someone or yourself to install it.

I hope my reply answered your question and that you are satisfied with it.

related resource: software protection

I dont think its kaspersky because I am using it on my system and its fine. You need to check if you have enough ram tho and disable some of the processes that are not that important. Try to run MSCONFIG.EXE and uncheck those progs that are not that important since they load during startup. careful tho, you might disable an important process.