here's my problem: my mother's ex-boyfriend's son installed counter-strike on my computer, and now i need to uninstall it but since i don't have an account i can't do it, is it completely impossible to do it without an account? or does anybody know how it can be done?
i hope someone can help me because i really need to get it uninstalled.

right click - > delete LOL

that won't uninstall it, just delete the link....

go where steam is installed and delete the folder

Add/Remove Programs in Control Panel.