I agree that they are red aphids and they are sucking the good from the plants. A forceful spray with cold water helps or try insecticidal soap. Mix with water as per package instructions and spray the plant. The soap will also kill any eggs and it is completely safe. Then watch to see if you've missed any.

Fire ants make mounds and not holes. The mounds start out small and become larger as the colony population increases. These mounds look rather innocent until you disturb them, and ALL of the ants boil out of the mound all at once. Again, there is never a discernible hole. I never worry about ants in my yard and garden, other than fire ants. Fire ants can be a problem for humans, pets, bird nests, beneficial insect eggs and larvae, and such.

i use this product http://www.scjohnson-egypt.com/nqcontent.cfm?a_id=2397, i don't know if it's effective as liquid fogger or not but they work the same. those although aren't that effective for the insect i'm talking about, when i start this device it repels them for a couple of hours then they start again but not as vigorous as they do when there is no fog. i tried to leave the room open for some nights and let this repellent thing does it work, but no use. they seem to know where they are going, it doesn't seem like an infestation although , it rather seems like they are a group that stuck on me. today i've found one of them dead on my disk, i don't know whether i could send a photo of it or not, and if i could whether any one will identify it or not. so i need more advise. thanx

Difficult to tell for certain. Possible true bugs (Hemiptera). Suggest you flick each and everyone into soapy water asap. Where do you live?