RampantAndroid
Diamond Member
Never upgrade an OS between major versions. Ever. Clean install it with the latest fresh drivers. You can get the strangest issues if you don't.
I have a work machine that dates back to a 64bit clean install of Vista. I don't doubt some funny things can happen and maybe I've been lucky, but I've got 4-5 different work machines ranging from VM hosts to build machines and upgrades work fine.
thanks guys, R.A - so i could just install the final over the preview and carry on. avoid having to reinstall everything basically
Sure. I still don't advise it. While I think upgrading from one *released* and *final* version of Windows to another *final* version is fine (say, Windows 7 SP2 to Windows 8 RTM), I don't advise taking a Beta, pre-release, preview or any other version and using it prime time, or upgrading it to the final release. When Yosemite released, I wiped my developer preview build completely off my hard drive and did a fresh install on my macbook.