How do you usually update your device drivers?

[shiby]

I want to trust "system update" because it checks the whole system for software and hardware issues specifically for "ThinkPads".
But sometimes i just can't. It reports successful installation while actually did nothing or even failed.

So...

How do you usually update your device drivers?

- Through "System Update"?
- Through "Windows update"?
- Download and perform a manual installation?
- Third party software?
- other options?

- or combination of all of above?