Windows problem

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Hi buddy.My computer have a problem. Now we are staying in the last of 2008 and I am using windows xp service pack 1 since 2004 when i buy it.But I can`t install service pack 2 in my computer. My computers configuration is (intel celeron 2.4ghz.512mb ram,32mb graphics card).My motherboard is A brand of Msi.Instead of service pack i cant use the upgrade versions of windows media player, cyberlink power dvd,winamp and so on.Now a days i also feeling some problem also in my internet expoler.Now i want to get rid of this problem. please help me.