(XP) Something happens, can't open any program.

  Zongooo 17:04 13 Apr 2017

Windows XP -

A couple of times recently "something" has happened when I was using an application (possibly Firefox) which prevents me from running any program. Everything looks normal but, If I try to start my email program, nothing happens. If I try to start Paint Shop Pro I get a screen but I cannot load any files (the browse button doesn't work and I get a "working" cursor but nothing happens). Even a game I have loads one screen and then hangs. I can open Task Manager once to close any partially open applications, butI cannot open it a second time. Also windows explorer allows me to open a window or two and then hangs.

I have looked in the windows log files, but there is nothing obvious there.

AVG recently updated itself which may be a factor.

Any ideas?

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