Minecraft is giving me ''Unable to access jarfile'' error, how do i fix it?

I don't know what i did but i deleted.minecraft file from %appdata%, just to reinstall it, and then i went to minecraft.net and downloaded Minecraft again. When i clicked it gave me an error saying ''Unable to access jarfile C: Users\Toshiba\Downloads\Minecraft.exe'… If any of you guys could help me, i would be so greatful!

I'm not sure exactly how to fix it but try to delete all minecraft files and then re-download them. If this doesn't work, try looking up jarfile on the internet.