Buy "business" laptops
You don't get this shit with Apple because you pay a minimum of £749 for a laptop, and at that price, there's plenty of profit margin. If Apple tried to sell a £300 laptop, they'd be stuffing crapware on it too.
It's really a problem that infests so much of life, that people buy on price rather than value. You can get a £379 Thinkpad Edge from Lenovo and at worst you can describe the pre-installed stuff as "maybe useful", like an Office trial, or a copy of Picasa. And they're solid machines. But a lot of people will look at that next to a £239 Dell Inspiron and go for the Dell.