how to check how long the guarantee is valid for my laptop?
Hi Lilinkaaa and welcome.
Was your Vaio bought in Europe and is it a European model? If you have a US model, then there are complications. Which model do you have? Is it registered with Vaio Support?
The usual warranty in Europe is 2 years from the date of purchase. (This is different if purchased in the UK or Ireland).
Have a look here: -