In reply to outtathaway:
If the thread is stripped then as Mr. InaBox has suggested suck it out or use something sticky. If it is the head that has stripped then you've got a different problem and a fair few options depending on the size and type of screw:
- Drill it out (Fast, easy but possibly terminal for the laptop if you aren't careful plus you'll need to re-tap the whole and use a bigger screw).
- Cut a new head - Larger domed headed screws can be 'fixed' by carefully filing a slot in them with a needlefile. This is pretty fiddly though on smaller screws.
- Screw extractors are handy if you can borrow some, the cheap ones are normally rubbish though.
What sort of screw is it and what is it in? If it is a retaining screw for a removable drive then try
gently pulling the drive out while turning the screw, it gives something to bite against and sometimes works.