Three days ago the cursor on my (non laptop) PC windows vista home premium began to behave erratically. When I type it skips back to a previous line and inserts text there before notice what is happening. When at rest it seems to pop up unwanted window panels (not advertisements). I have reverted to a early safe point without success. The mouse is a logitech and I think I have updated the driver. I have checked the registry with uniblue and the problem is as bad as ever. Can anyone suggest how to sort this out? Thankyou