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I tried the remedy to that common issue and now it works perfectly. Thanks a lot.

I have found a problem when running tecnix center. I have isntalled adobe reader 10,miktek 2.9 and tecnix center in windows 7. Everything goes fine until I use the packages tikz, pgf and graphicxsp. I know pgf is installed and graphicxsp is installed too. But I cannot find tikz in the package ...