how can i contact r_travel@europe.com?

how can i send email to r_travel@europe.com?

someone has hacked into my computer and is sending random e mails to my friends, they are not malicious but i feel my privacy on my computer is lost. i am not very computer litterate and i do have security installed, i am now wary of going on line as i dont know if this when the hackers can infiltrate my computer.help!!!