When we talk about HP products, There is a huge difference between consumer and business products. I think Skuzzy is talking about consumer PCs and laptops? right?
Whatever, you can allways install clean windows (or linux) to HP computer without extra software.
I have 10 years experience of selling and supporting HP products, PC:s, workstations, laptos, printers, servers, storage and network products (99.99% of them business products) and they have been really reliable systems over the years.