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Read the release notes for B5500. It talks about several problems related to BIOS features and problems with unpatched BIOS on certain machines (especially ones with SATA).
the error usually means that the SafeBoot.sys driver is still in the registry, but the file is gone.
most often I see this with people doing system restore activity - restoring from an uninstalled state to a point where SafeBoot was active.
to fix, use the recovery console, and make a copy of serial.sys called safeboot.sys.