A guy seems like he wants to talk to me...but....?

Listen to your friends... Just drop something on the ground as he walks by... He'll stop to pick it up, you say "Thanks", and hit him with the smile, and that doe-eyed look that women do to make mens knees weak... He'll probably take it from there...

Live a little, Ask him to buy you lunch or a drink for looking at you, smiling etc. i doubt he will say no.

first of all take a deep breathe just let it come natural when he says hi to you say hi back to him and then ask him how is ya day going then hell answer back and then a conversation will start

next time he says hi, say hi back, and introduce yourself, and he will do the same, then ask what he is having for a break or do. or take extra of whatever you to take to your break and share with him.

Invite a couple of people to lunch and make sure he's one of them. Maybe in a group, he will be more likely to socialize with you.

Ya know, it might be cheesy but I am voting for the drop something... seriously, I've done this recently and believe me, it worked out for the better. :-) Good luck!

next time when he say hi, say hi back. then, start a conversation. or ask him (if on lunch break) where's he's going,

have a party and invite the whole staff, making sure that he isn't working that time, invite him first to make sure that he'l be able to come and if so then invite everyone else.

Tell him that you would like to take him out to dinner

ask him for a good scarey halloween movie to watch for halloween