Thanks for all your replies, apologies for the delay in replying back.
In answer to your replies I can add the following.
I am running XP sp2, The new drive was sent with XP pre-loaded but no drivers and after various other minor problems I had to re-format this drive using my manufacturer supplied recovery disc. When doing this I was advised to unplug the D drive to prevent accidental (I am a novice user really) reformatting of drive D, up until this point the system recognised drive D, It is after this re-format that drive D has dissapeared from My Computer and is inaccessible to my amateur use. When you open device manager it shows the drive and confirms the drivers are all current etc, I am just unable to access any of the data.
Unfortunately I havent been in a position to try the drive in another PC, perhaps that is the next port of call, to make sure it is not just another corrupt drive.
GX1 man , will try your advice links tommorrow and report back.
I am sorry if my query and explanation sounds a little vague, but I am no expert I am afraid.
Once again, thankyou all so much for your time so far.