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It could be something very simple, For example, If you just put gas in the car, the gas cap may not be screwed on correctly, or something more complicated. Generally, unless the check engine light is blinking, it is not an intimidate or major problem. If you go to AutoZone, They will get the diagnostic codes and tell you what the problem is, at no charge.
Sounds like you just need a new window switch. I had a similar problem with my car, and all you need to do is replace the switch for the window that is not working right. This shouldn't be very expensive to fix.
Whenever i turn off the Air Conditioning in my car, it will start to idle higher and higher, going all the way up to 3 and sometimes even 4 thousand RPMs, but it goes back down to normal when i turn the A/C or heat on, and there's nothing wrong with the way it drives, only when it is idling.