I am unable to boot my Windows 8 in safe mode. I want to use ESET purefix. Is it safe I tried running msconfig.exe But I am unable to click in any of the boxes marked. Its unclickable in only boot tab. I have uploaded image. I have also tried to boot in safe mode through Startup Reapair Boot. I went in advanced settings and clicked on restart for safe mode. I got error d000000f. I also tried the option from Purefix 2.02 to boot in safe mode. But this also didnt worked. Any solution for this?