Windows 7 - Not responding when installing programs


I have installed Windows 7 RTM and everything is working just great for more then a month. But now I am experiencing some problems when I am installing larger programs or games. When installation starts, the system starts to freeze and I cant even normally switch windows or browse on internet. This lasts until the installation is complete, then everything comes back to normal. The same thing is happening on my laptop.

Does anyone know why and how can I resolve this problem?

Ok, so nobody knows the solution for this problem or what?

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