Why does my computer freeze on MAC OS X Lion?

Since my friend insalled MAC OS X Lion on his iMac Desktop Computer we have been having a lot of freezing and sometimes running slowly! Does anyone know what is going on with this or is it the iMac problem! My friend Jacob owns the 2 iMac Desktops that are having problems!
< Edited By Host >

In the 2 iMac Desktops we have 4 GB of RAM and a 500 GB Hard Drive!

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9L30
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kalloc.128:2445312
kalloc.256:80748544
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ipc ports:1197700
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vnodes:5018400
namecache:1644240
HFS node:6737024
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buf.8192:56360960
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com.symantec.kext.filesecurity          1.3.3f65
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com.symantec.kext.pf          4.1.1f13
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com.symantec.kext.internetSecurity          1.3.2f5
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