Unable to dimension a sketch in Solidworks 2013

I have had to reinstall Solidworks 2013. When the program installed I am unable to dimension any sketch entities. Also the planes are named "?????". There is also a dimension symbol beside the cursor, I have never came across this before and I am unable to solve this problem. Does anyone know how I can solve this problem. Any help is much appreciated :)

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Try pressing V
This is the shortcut key for "Filter Vertices".
You can also turn this off by pressing "F5".
Then deselecting it from the lower toolbar to the far left.

 
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