repeatedly press F8 key at startup until the safe mode options appear (some times u have to wait until after the bios loads b/c F8 key is assign some other function within the bios). use ccleaner to clear temp internet files (you can also clean the registry, and remove/uninstall rogue startup apps and files) then run malwarebytes or super anti-malware. uninstall any instances mcaffee and norton internet security (that shit is garbage). remove toolbars, "free" games, weatherbug, etc. google any programs or startup files that you are unfamiliar with, to verifiy there legitimacy. never have more than one antivirus installed on your computer, ur computer will perform as if it has a virus. if you have windows 8 make sure you upgrade to windws 8.1 through the windows store. google a good windows 8 tutorial and read it or view it if it is a video. windows 8 ain't that bad, it is actually faster then windows 7 but you got to get use to it. Windows 8 has a built-in antivirus and antimalware called windows defender use it (control panels). scan the computer in regular mode and then in safe mode to be sure virus/malware is eliminated. google is your friend. good luck.