My home computer does not always properly enter into the safe mode operation only?

Users questions:My computer is automatic landing, as long as the boot automatically login to the Internet, is the Gehua, but recently a difficult problem, as long as a turn on a black screen can not go to the WINDOWS years, not to mention the Internet, but if I transferred to a safe mode where you can enter to WIN normalDOWS in, and access to the Internet, originally thought it was a result of poisoning, the machine re-installed all the software box, kill poison, to be able to properly entered into on the back, but just a start, is always repeated restarts, and then I the chassis pulled behind the cable can be entered on all right can be used, of course,Is not online, but as long as a chassis plug on the cable after the break, the results got the song Chinese staff Jinong, they said do not know what went wrong and insisted that their cat is no problem that my machine poisoning , but I simply can not just re-Bahrain poisoning, now in the end what is wrong, really YuDied of suffocation. Please computer experts to help solve this Thank you pull! Yearn!!!
Experts answer: two days before my computer is, ah, go on a restart, that virus is still not
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