I am in dire need of assistance with my laptop. i am having problems starting up win dows. it gives me a black screen with the error message that windows was unable to start. a recent hardware or doftware change might be the cause. the options to launch startup repair or star windows normally are the choices. i have tried the startup repair to no avail. I have tried to boot in all safe modes and it will not boot up. as a last case scenario i tried to do a system restore to an earlier point but i get no where with that cause when i click on the last date to restore from i get a message that the drive is Local Disk (C:)(system) and the status says: you must enable system protection on this drive. so i cannot even take that route. it also has a yellow caution sign that says: you must always restore the drive that contains windows. restoring other drives is optional. before i had this problem i believe a virus attacked the computer. i ran a test and several threats were shown to have been removed. please help with this cause i have very important football and pole vaulting videos of my sons on here that cannot be lost. please, oh please someone help me out.