Acer desktop (running Vista) ?

it might need formatting?

right click my computer (will be called just 'computer' in vista) click manage then click on diskmanagement on the left.

if you see a drive with a black block right click and create a partition

worth a try

Tomlad
June 2010

Then from what you say the diagnosis is absolutely conclusive - the Memory Stick is defective.

Peccavi
June 2010