[PC] Skyrim Legendary Edition with High-res DLC and Creation Kit: 8x AA sample and lower resolutions unavailable in the launcher. Is this normal?

Hi, this is a fairly silly question, but it's been bothering me that the Skyrim launcher doesn't show the 8x AA option on my PC as well as the fact that I don't see resolutions below 1280x720 even with "Show all resolutions" ticked. This is an absolutely fresh install (deleted what I had and copy pasted my pristine install folder backup [7z]), so things should be working just fine.

Let me add that I know this could be a consequence of my system specs and the launcher deciding that 8x AA is not going to work. However, this doesn't make too much sense to me. I want to know if it is a feature or a bug. If it is a bug, I'd love to try and fix it even though I know that I can set AA to whatever I want through the ini files or use mods and such to control it differently, or even use CCC... I'm just trying to figure out why the launcher is behaving this way.

##System Specifications:

Laptop Model: Dell Inspiron N5010 (Old) [Bought in August 2010]

Processor: Intel Core i5 2.40GHz Dual Core CPU with hyperthreading.

RAM: 4GB

Video Card: AMD Mobility Radeon HD 5470 with 1GB GDDR3 VRAM

Hard Drive: 512GB 5400 RPM

OS: Windows 7 64 bit

Update 1: I've found that the other resolutions are accessible by selecting aspect ratios other than 16:9 and having the "Show all resolutions" checkbox checked. This is probably normal behaviour, though I'd still like to confirm that this is what happens with everyone else. I've still not figured out why the 8x AA option is missing. Finding the correct search terms and setting up the search to get the best results on Google is proving to be difficult - no definitive results yet. All I've confirmed is that there should be an 8x AA option just as I thought.