This is one of the reasons why I dislike laptop personally. Like 90% of them force pre installed Windows with a bunch of crap added aka - Bloatware I'll never use and of course the laptop price is increased since Windows ain't free.
My suggestion:
1) Do your homework before buying laptop xxxx, if you know it comes with Windows 7/8.1 then download the appropriate non OEM iso (it's legal btw) from a different computer and reinstall the system from scratch.
If you're not very techie, take it to a friend or a good PC shop that will not rob you alive for a simple reinstall.
2) Install Linux, a good list of distros (editions) can be found here:
http://distrowatch.com/
3) Buy a different brand.