Just to complement what's already said, sometimes Win7 LUT loader isn't enough to solve this problem. On my Lenovo notebook I had also to remove OneKey Theater button application (which eventually changes LUT between 3 builtin and horrible ones) and to disable igfxpers.exe through MSConfig startup files. This application seems to be responsible for some detailed settings (and in many cases useless ones) into Intel HD Graphics drivers and resets LUT after suspend, hibernation, logon, logoff and many other actions.