EISA configuration

Question

I have had to reboot my system with a backup file using ACER e-recovery management. since then my usb hard drive has not been assigned a drive letter in my computer but is showing up in disc management by right clicking my computer. right clicking the hard drive only gives the help page, no access to re-format the device to bring it back to a recognised drive accessable by "my computer". There are no conflicts in device manager and the hard drive is there showing as no problems and enabled. I have tried to remove and reinstal the device but it still shows as EISA configuration. Can you advise me how I can reconfigure the hard drive to remove the offending EISA configuration and regain the original status and configuration of the drive? Thanks