While I type my cursor jumps to anathor place in the document and continue with what I am typing at that moment

SOURCE: I have a Compaq Presario CQ62. When typing

This typically happens when the typist's palms touch the touchpad, which the pad treats as a mouse click. See if the cursor is jumping to where the pointer is.
Most touchpads have a control panel (usually part of the MOUSE Control Panel) where you can reduce the sensitivity (or disable) the left click function from tapping the touchpad.

Testimonial: "Hey thanks! I hadn't realised I was doing that. Will lift my palms or use an external keyboard in future. "

SOURCE: Hello - I am correcting

Try going to H.P web site and select support or support forum. Once there, they should be able to have a solution for you. Because, I know there is a key that you hit, to prevent auto-correcting. I hope this helps.