|Did you make sure that there was only one hard drive connected when you installed Windows? This is important.|
Did you make sure that the hard drive is set as bootable and is only behind the DVD drive in the boot order in your BIOS?
Did you make sure that the Install DVD is removed from the DVD drive?
Did you make sure that you did the Custom install and go to the Partiton/Formatting options, delete the existing partitions and create a single partition and format it to NTFS (If you are going to use more than one partition on that drive, leave the extra space as RAW for now, you can partition it later in Disk Manager)? Then install.
Did you make sure that your BIOS was set as far as Date, Time, CPU, RAM, Graphics (Onboard or PCIe), SATA, Bootable drives, Boot order, etc?
Did you check your internal temperature reading within your BIOS under health usually? High readings or readings that climb while idling in BIOS will mean that there is a cooling issue or a Thermal Compound application issue.
Did you make sure that your CPU is on the CPU support list for your motherboard, but not just for the motherboard, but for your BIOS version since later released CPU's may require a BIOS update to operate fully or even at all?
In the future, Please post all hardware specs including makes and model numbers. The more details we have, the better we can help you. For example, if you posted the full model number of your motherboard, we could have looked up the CPU support list and told you if you needed a specific BIOS version. This way we can post suggestions and you would have to follow them up.
You have to be a little bit crazy to keep you from going insane.