OK we'll just take a guess then -
Do a Checkdisk/repair.
Run a Virus scan.
Go to Control Panel, Device manager and check if every device is working and has an up to date driver.
Go to Uninstall programs and uninstall anything you know shouldn't be there eg old graphics card drivers.
Did you have cpu or graphics card overclocked?
What cpu temps ou getting? - read from bios/uefi.
What graphics cards temps? - Afterburner
Post your build