I've had some problems with my old laptop since installing and running AVG and Spybot S&D to clean it up. For example, I can't use Internet Explorer anymore. (I download and install from Microsoft, but it still won't run.) But right now, I'm curious as to why I can no longer double-click an icon on my desktop to launch an application. This problem is true for Firefox, Word, Skype, etc. Any ideas? I've looked all over for a setting in Windows that I can change, but no luck.

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