@ Sven & Co.
"...the laptop is not up to the job, with its single core CPU and 1GB of RAM.
If the general public are installing Vista on pieces of rubbish like this, then they are going to have problems."
You're getting it the wrong way round - the OS is meant to run the hardware, not vice-versa. (Remember, it's an Operating System, not an Operated System.)
So if Vista can't operate most people's hardware then it's no good for them, is it? I know that computer technology marches onwards and upwards, but Vista requires a Great Leap Forward in terms of power and cost which most people aren't prepared to pay.
Microsoft fumbled - they wanted people to buy Vista but XP running on an old PC with 512meg of RAM does everything most people want. Why pay good money for no obvious benefit?
Vista is the wrong OS for your laptop, obviously, but MS offer no suitable OS for sale. If Microsoft is wanting to sell a niche OS for high-end gear then that's their choice, but I don't think that was their plan.