i built my pc a four days ago and it has been working fine but when i went to power it up this morning it said configuring updates so it did that then restarted and took a long time to boot up but when it did it went to the same screen again i let it configure the updates once more and then it booted up again really slowly and got to the login menu and because it took a long time to boot i decided to try and reset it again and ince then it has not booted i have tried refreshing but it says that part of the memory is locked and i need to unlock it and chkdsk said it found some errors but it did not leave any specific one and when i ran chkdsk /f it didnt fix anything next i tried booting without windows disk again but it gets past the bios and gets stuck on a blank screen with a flashing gray cursor what do i do please help?