Windows won't start. What to do?

Question

Windows

In general, this is the situation. I installed Windows 7 SP1 x64. Everything goes well until the launch selection. Wherever I click, it starts to load, Good, which I can’t see and immediately on a new one. I don't know what to do. Help

Answer 1

Format hard completely - or overwrite the bootloader in the MBR before installing the partition with the old system. Cant in the boot record - two records and both point to the old system. Sometimes this happens when you install from a flash drive - the flash drive becomes the first disk and an incorrect entry is created.