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Does it do this on the wall power supply?, I suspect not?, It may well be in the Power Settings for the system, but if on battery sometimes the screen dulls right down to save battery, and the lower th battery the duller the screen... If at home, it really should be plugged into the adapter, and really only used off adapter when out, not near power. The power settings ACPI and used by Windows. seems to be to dowith it as you say BEFORE Windows loads, it is OK, after it is not, so it must be a Windows setting?
If the brightness is dull even when connected to the mains, it maybe that your back lighting is faulty on the screen and you will need a qualified repairer, although it may be worth looking at a new notebook depending on the cost.