OK, nalle.ro welcome to AO.

The advice to use the boot disks/CDs is good, and it does work, however................

1. Is the computer yours, or is it just one that you use?
2. Is it the administrator password or your user password that you have forgotten?

If the computer is not yours, please contact the owner/administrator and ask them to reset your user password.

If the computer is yours and it is the User password that you have forgotten, use the administrator password to reset it.

If it is the administrator password and you have another user profile in the administrators' group, then you can use this account to reset the administrators' password.

If you only have one administrator account and you have forgotten that, you will have to use one of the tools suggested in previous posts.

If the computer is not yours, please do not attempt to reset the password yourself. You can get into big trouble that way.