Swifty - You have a Laptop sold on line by Hi-grade 0208 532 6111
Their web site show just two Vista machines...
The Notino D7000SRA model has two DDR2 (667) SoDIMM socket memory slots and can be expanded to 4096MB
The Notino W5800P model has two 200-pin SO-DIMM DDR2 RAM Memory Module slots and can be expanded to 4096MB
An XP machine the Notino uL100 model has just one 200-pin SO-DIMM DDR2 RAM Memory Module slot with a limit of 1024MB
When adding memory to a 2 slot machine you sometimes have to discard some existing memory - for instance 2x512MB = 1024MB and the machine is full up - to add another 1024 bank or a 2048 bank means removing an existing 512 bank.
Memory may be bought all over - Hi-grade may even sell you some - PC World perhaps and probably the best in the UK is Kingston Memory but their web site does not recognise any Hi-grade machine.
Peccavi, December 2008