Hollo! Good morning, i have an hp envy touchsmart machine and the operating system which was on it got currupted. So i formatted it and intalled a new windows 8 on it. I checked for windows update and i downloaded new uupdates but then, the update couldnt installe and the machine automatically reverted itself back to the previous setttings. since then, the tuchpad cursor has disappear and i've not been able to use the touchpad again. I've done everything i can but to not avail. Pleace help me