|If you tried all of that then the last thing your left with is purchasing a new operating system. You can do that from websites like newegg.com and amazon.com.. when you search the websites, make sure you get the OEM product, for operating systems its only about $112|
However, I would like to make one recommendation.. Windows Vista is a very unstable operating system, and has many issues as a whole. Look on Toshiba's website and see if your laptop is compatible with Windows 7; if it is, I recommend that over Vista. They will be the same price anyway.