hi all!!!!!!!
thanks for your suggestions and answers.have done little research as suggested in the first post and found that its muma worm which i removed with symantec fixing tool.Thanks for that.
our company does have licences for symantec and updating virus definitions its our own responbility which as i experienced somone doesnt update at all.
i will ask our administrator to look into this problem as our company has 20 000 employees and we are not talking about 1 personal computer
once more thanks for your contribution and as usual you come with fast adn correct answer/solution.