Open Question: Why my programs suddenly disappears without any error msg?

When i try to install any program like java, windows live messenger, limewire, and nero, the installation window suddenly disappear without any error msg. and i cant install them. my friend have installed new windows for mw but still same problem. how can i get rid of this. I am using windows xp with service pack 2. and i try on my second computer there also same problem. i have a home network of three computers. all have this problem. :((( please help me. thanks

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