Is the screw heads slot type, with a small pin in the middle, stopping you inserting a normal screwdriver. If so, these are 'Security screws and a small set of different 'bits' for a screwdriver, can be purchased at "screwfix.com". Try the link below and you will see the small set that I talk about. £3:50.
http://www.screwfix.com/cats/100193/Screwdriver-Bits/Security-Bits
If the screw heads are like a circle with teeth on the edges, these are 'Torx' Bits and any diy store, like Homebase or B&Q will have the type and size required.
See the link below for the type of screwdriver and assorted bits which will do the job.
To see the type of bit I talk about, check out the link below.
http://www.screwfix.com/prods/98384/Screwdriver-Bits/Specialist-Bits/Wera-Extra-Tough-T25-25mm
This link below, will show you the type of screwdriver available in B&Q which has some of the "Torx" bits included.
http://www.screwfix.com/prods/72752/Screws/Screwdriving/Screwdrivers/Stanley-Multi-Bit-Ratchet-Screwdriver
Davymac, July 2009
