Pc slowed down after cpu upgrade

Hi all,
I just installed an ATHLON 64 x2 (dual core) 4400+ processor on my MSI K8N Neo4 Platinum/SLI motherboard. previous i had a single core AThlon 64 3700+. With the new processor th epc seems to have become slower the cpu usage in frequently to 100%, in my opinion for no use. have anyone an idea on what could be the problem?
thanks for your help.
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More about slowed upgrade
  1. You most likely need either the AMD dual core optimizer or the Windows XP dual-core patch (either of which fixes certain system timing issues when moving from one to two cores ...)

    IIRC, you don't need to install both of them --- that creates additional issues.
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