Solved the problem, i downloaded windirstat and it showed me were all my space went.
My windows PC has 74.5 GB of hard drive space it currently says i have 5.49 GB free.
All i have is low space programs (microsoft office, flash player etc) and he default programs it comes with.
I have try it all(I have deleted temp files, perform disk cleanup, defrag), but still i have not found were the missing 70GB of space went.
Please help

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