Why does Witcher 2 crash so much?
Collecting too many saves may lead to crashes. Delete the unneeded saves. Do it using Delete option in Load Game menu or straight in the folder where the saves are stored: (...) Documents\Witcher 2\gamesaves.
If your Witcher 3 keeps crashing, it is possible that you don't have correct graphics drivers installed on your computer. Graphics Drivers are the main components that facilitate the interaction between the game and the hardware. If the drivers are outdated or corrupt, it will cause the Witcher 3 crashing.
How to Fix Lag/Play/Run 'The Witcher 2: Assassins of Kings' on LOW END ...
The game is graphically demanding because the game is more graphically complicated and impressive compared to the games that you mentioned.
Processor: Intel Quad Core or AMD equivalent. Graphics Card: Nvidia GeForce 260, 1 GB memory / Radeon HD 4850 with 1 GB memory.
Collecting too many saves may lead to crashes. Delete the unneeded saves. Do it using Delete option in Load Game menu or straight in the folder where the saves are stored: (...) Documents\Witcher 2\gamesaves.
Choosing to simulate a Witcher 2 save lets you answer with dialogue options, effectively allowing you to shape Geralt's backstory to an extent. Selecting "No" when asked if you want to simulate a Witcher 2 save disables these dialogue options, and the game presents you with a set of premade outcomes.
By being more linear, The Witcher 2 feels more focused and to the point, having quests and side quests that don't deviate too much from the base plot. This contrasts the main questline of the third game, where you have to run back and forth with little advancement.
First of all, it is quite a bit shorter. The Witcher 2 can be beaten, even with a handful of side quests, in fewer than 30 hours. The Witcher 3 demands at least 50 hours of your time, and can be stretched out to well over 100 hours if you like to get sidetracked.
Witcher 1 has the best story and best character interactions and best/most impactful choices and best romance features. Originally posted by MrBabam: Technically, since your major choices and outcomes carry over from each game into the next, the answer is "all of them."
Will my computer run Witcher 2?
Processor: Intel Core 2 Duo. Memory: 4 GB RAM. Graphics: GeForce GT 650M 512MB (on 1440x900, low), Radeon HD 5770 1GB (on 1440x900, low), Intel integrated graphics chipsets are not supported. Hard Drive: 25 GB HD space.
All in all, the graphics of witcher 2 are not only up to date are better than most games i played in the last 2 or 3 years, hands down one of the best games i have ever played, i even restarted my playthrough to do it fully completionist, and im not even looking forward for w3 anymore, im enjoying this big time.

An intel 620 will run the game, and intel 4000 will run the game, just not very well.
The Witcher 2: Assassins of Kings Enhanced Edition will run on PC system with Windows XP/Vista/7 and upwards. Additionally it has Mac and Linux versions.
When focusing on the main objectives, The Witcher 2: Assassins of Kings is about 24 Hours in length. If you're a gamer that strives to see all aspects of the game, you are likely to spend around 54½ Hours to obtain 100% completion.
Hard Drive: 15 GB Free.
Set the power management mode to "Prefer maximum performance", the preferred NVida setting is Adaptive but apparently either the game or the cards can't cope with that settings and the screen locks up, specifically so in menus. I did this on my end and it solved all crashes I was experiencing.
If your video card or any other hardware is overheating, the computer to fix the issue crashes the game. Corrupt/incomplete installation: If your installation is somehow corrupt or has its files missing, you might experience the abrupt crashing. Verifying the game files might help and fix the issue.
Witcher 3 not launching is probably caused by driver issues. If your device drivers (especially your graphics driver) are outdated or corrupt, you may bump into Witcher 3 not launching or crashing issues. To improve your gaming experience and fix bugs, you should always have the latest graphics driver installed.
1) Updated to latest graphics drivers. 2) Verified integrity of local files. 3) Uninstall and re-download the game. 4) Disable the Discord overlay.