Did it always run slow or has it gradually gotten worse? Ever heard of Virus, Adware, Spyware, Trojans? I suspect you have either run across one or more of the aformentioned bears and/or your hard drive is nearly full. I don't know any of these factors and I cannot see your pc over your shoulder by magical means so you gotta tell me.
If you wish to see if there are newer drivers, please visit the manufacturers website.