HIV will be SPEARED by during shaking hands?

one month back i have met my friend during that time i was shaking my hands with him and my palm is havings wounds because of i worked in stone field.I heard now he is having HIV positive then i took my HIV test(ELISA),the result is negative eventhough i am afraiding ,window period is minimum three munths that i read in via internet.Please give me details about in hiv and i have to take any hiv test further more.