Frank,i can still access it,fully.Just that this run time error comes up everytime.if i close the error box down,it shuts down the explorer window showing my drive files.If i leave the runtime error window open,i can access all my files.
SORTED!!more by luck than judgement.I had a corrupt folder(not virus,just corrupt).Deleted it and hey presto,all working.Phew.Time for bed now.It is 1am!!