Go over to your magic menu and go down to powers, it should be there
as long as you have 2gb of ram, which is how much Bethesda have restricted Skyrim to use on any computer ( without the use of a mod), you should be able to run Skyrim, mediocrely
skyrim
Use a Khajiit, they are good at sneaking.
You 'use' RAM, not lose it.
Get the conjure familiar spell and use it
They have poor eye sight but they see better at night. In the day they use their sense of smell.
Equip arrows and then use poison.
Yes, all playable races can use shields.
Dark Elf, Khajit or Argonian
If you have Hearthfire installed you can use them to make Flour from Wheat.
It will be pointless to use eye whitener at night whether you have been prescribed for or you bought it over the counter the purpose of it is to make your iris white, so if you use at night and wake up the next day, you'd still need to use it again. Better use a good lubricant so that your eyes don't get strained from drying when using the contacts or rather give the contacts a break if they make your eyes too blood shot that you look as if you are drunk :)
Are you referring to the entire screen, or your character's "vision"? If so, then that means your character has some kind of Night Eye effect in use. This may be caused by taking some kind of night eye potion, casting a spell with a night eye effect, or wearing some kind of clothing with a night eye enchantment. The Night Eye affect gives your character the ability to see in te dark. Khajiit race players have this affect permanently, and it cannot be removed. If you are akhajiit player, the night eye effect shoudl wear off once it becomes light again/the sun comes back up. If you are not a khajiit player, try checking all the affects of your enchanted clothing to see if that is what is causing the blue vision. If none of this works and it turns out that your character is not experienncing the night eye affect, it sounds as though you have a technical problem on your hands which, unfortunately, I cannot help you with.