When I start my laptop up, it just stays on the loading windows screen - why?

It may not be a virus. It sounds more like a corrupt file that's trying to load with windows. Files get corrupt if you open them and dont close them properly.

Start Windows in safe mode and go to system restore and start windows with a previously known good version. If you have installed anything since then, it will be lost but at least you can restart Windows.

Do a system cleanup after you get it running

Cheers

Alot of cases the subject stems from the start up courses the laptop has to laod or now and back there replaced right into a subject with the start up application altogether and is lacking a code line to allow you to end the start up technique, maximum cases as tech can pass in on secure Mode and take out the bothered courses or sparkling the setup codes.

The problem could be an installed service - start Windows in 'Safe Mode w/ Command Prompt' and do some searching...

Personally, I think you should switch to a Linux-based OS though.

Windows has been corrupted. try to open the recovory drive by pressing f10 on startup repeditively.

There must be something wrong, take it to a professional.

You have a virus, or your laptop is just slow.

Get it checked.