So, for the antivirus thing, yeah it's a pain, but it's simply because the AV doesn't know the file itself. Simply exclude it from the sonar and everything will be fine (i usually exclude the whole folder).
So, talking about the problem itself...
it seems to me that you are doing something wrong.
1- Seeds can't be used to make drinks, the have to be planted by your farmers in farm plots. This will give you food. In addition, you can pick up plants from the ground by enabling the Plants Gathering job on one or more of your dwarves, then highlining a nice chunk of earth with the [d]-[p] command.
2- If your food is rotting, that means that it is not stored in a food stockpile. Simply make a stockpile for food [p]-[f]-[enter] to define the area then-[enter] again to finish defining. After this you need to have enough barrels, built by a carpenter, to store every single piece of food. The cook will then take it to make meals.
3- Cooking right at the start is not a good idea, in my opinion. You nedd the seeds that are destroied by cooking, and to have good ingredients (flour, meat etc...) you need a pretty advanced industry. I usually start cooking food only during the second year. Again, this is only my opinion.
4- You mean spider man silk? Never saw that! By the way, monkey and hippos are not too much aggressive (well, some kind of monkey it is, but not everyone), simply avoid to give orders that would bring your dwarves too close to them.