I forgot to say that i live in sweden so im using swedish ISO-layouts! Other keyboards cant write three very important letters, åäö.
Yes, they can, all you need to do is properly set it to Swedish - US
International (THIS IS IMPORTANT!) Layout:
Go to your Input Languages on your Operational System:
![](http://i48.tinypic.com/6f8az7.png)
And open "Change Keyboard".
![](http://i48.tinypic.com/260rgut.png)
Click on "Add" and find "Swedish (Sweden)" and click on "Show More":
![](http://i50.tinypic.com/2gt4028.png)
And then, scroll down until you find US - International:
![](http://i47.tinypic.com/10ofw5k.png)
Activate it, click on OK, set it as default and remove all the other keyboard layout that aren't Swedish - United States - International.
It should become like this:
![](http://i46.tinypic.com/3132jp5.png)
It MAY not work at first, because some of your apps may still be using the old layout, so, if it doesn't works as soon as you did this (or works on some apps and not on others), just restart your computer.
I DO NOT recommend keeping more than ONE keyboard layout, since Windows is actually quite tricky and may do stupid stuff like changing layouts when you less expect.
Now, all you need to do is:
CTRL + ALT + W = å (Or ALT GR + W if the keyboard has ALT GR)
" + o = ö
" + a = ä
I write in Brazilian Portuguese using an US-ANSI keyboard with no trouble at all. We use letters like "é, ã ó, à, á" a lot and I don't have any issues at all.