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Hi, i'm on windows 8.1 preview, every time i turn my pc for the first time it gives me only a black screen with the cursor on it, and then when i turn it off and on again it boots normally, i reboot and turn off again and it works perfectly until the next day when i try to use it it gives me...

I'm new so please i don't know if this is where i should post, but lately my hard drive disk uses 100 all the time making my computer very very slow, any ideas? Thank you