Raid reader?

Hi everyone,

last sunday I got an alert that a server was offline. When I got to site and started the server there was a message that said;

it listed 3 of the 4 drives in the machine. So I went for the smart start disk to check array health which told me one of the three disks listed was facing an imminent failure according to S.M.A.R.T.
I have spent the last week waiting for the data to be restored but when I try and run the server I get an error telling me that PSHED.exe is corrupted or not available. However, when I boot from the OS disk and then, select Repair your Operating System it fails to find a windows installation so I am unable to replace the damaged/missing file.
Ideally I would like to get the server up and running again but I can make do with being able to access the files that are on there to transfer them out to the virtual copy of the server I had made a week before it failed.

Can anyone recommend a tool that will allow me to access the data on the drives?