Missyme, since Jews don't believe in "Christ," it would be rather difficult for them to believe in the "Anti-Christ." Regarding any potential Messiah, Jews believe first of all that he will be very human. Second, ALL of his predictions must come true. Third, he must obey Jewish Law - and, in fact, he will be able to close gaps in knowledge regarding Jewish Law that have existed for thousands of years. If someone claiming to be the Messiah can do all of those things, as well as have the Temple rebuilt, I'd have no second thoughts about his job description.
Alouette is also right about the Jews' view of Satan. There is no Jewish counterpart to the apparent Christian belief that Satan opposes G-d. He/It is merely an angel that tempts Man. In Judaism, no being or combination of beings could possibly pose any meaningful challenge to G-d, as He is the Creator and Master of the Universe - period.