Installation de Visual Studio 2005 Extensions

bonjour, mon pbléme c'est comment installé workflw foundation
jai déja installer
.systéme WINdows XP SP2
.SQL server 2005
.MIcrosoft visual studio 2005
.Framework 3.0
**Le pbléme quant je veux installer la temlpate c'était le suivant:
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Platform Prerequisites Missing
Based on the components you selected to install, you must first install the following prerequisites.

Windows XP Service Pack 2

Some required prerequisites are unavailable. You will not be able to automatically download updates.

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M'aidez SVP.