HELP! My computer was in for repairs and I didn't disconnect the external drive. Now, when I try to system restore, I get: "Changes made to drive F:\ after this point cannot be reversed because the drive was either excluded from System Restore Monitoring or was turned off or removed." I can't find anyone who can help me. Somebody talk me through it and don't suggest to disconnect it and restart cause I've done that already. PLEASE SAVE ME!