That's the problem, my cousins laptop run with nvdia gpu,, many things that i read online told that windows ten dont know which one to use,hence they suggest to disable one of them, but trying those methods still doesnt makes me close to the solution,duh...another thing that i forget to mention is i did try run the cmd from the windows ten advance boot option and type the bootmenupolicy legacy to enable the safe mode via f8 key, and then once i got into the safe mode, i delete the driver reboot and reinstall it fresh once again. I did try also downloaded the windows 10 latest update and install it.The problem with the clean install, im afraid that the key from my windows 7 might not compatible with windows 10. That's why i never run the clean install. I have the installation media ready though, the one that i've downloaded from kickass, but as i mention just now, the key is the problem. The next thing i did try is to clean install back my windows 7 using my key and try to upgrade it back. Yeah, my hours are gone just like that, but i did try so many things for more than half of my day.Still...

So you're sayin that I can do the clean install straight away from my windows 7? yes mine is the legitimate key upon which i bought my laptop from...i never change it..if this can be apply it may be a good news for me...i thought that we must do the upgrade first and only then can we do the clean install??? am i wrong??