I am having the exact same problem on Toshiba Satellite L300D Running Windows Vista. I have tried everything I can think of. Touchpad is fine for around an hour then suddenly becomes erratic and basically unusable. Did you ever find a solution?
My cursor still behaves erratically despite downloads, reinstalls, adjustments, & virus/malware scans--suggestions?
My HP Pavilion dv6704nr notebook is a little over a year old. The Synaptics touchpad was working very well until about two weeks ago. I tinkered with the pointer appearance and things went south. Since then, I've done everything under the sun to fix it, including driver rollbacks and updates from Synaptics and HP, system restores, etc. The cursor becomes more erratic (jumpy, bouncy, less precise) after longer periods of computer use (may be heat related). I've found that when I "reset devices," I can get relief for about one minute--then the cursor shoots up and down the screen--completely out of control! The good news is a cordless mouse has resolved the problem, but the touch pad remains disabled. I would like to enjoy the convenience of a touch pad again. Has anyone resolved this problem or made a conclusive diagnosis? If you were able to resolve the problem, please share. Thanks.