New
#21
Follow Zigzag's guidance on running chkdsk /r as Admin.
Then follow the tutorial Karl posted to wipe the HD to clean install Win7.
Let us know how it goes.
Hi everyone,
Ok all resolved now. It turns out my PC was set up in a RAID config, but somehow the BIOS settings had reset and the SATA config had reverted to IDE, not RAID - no idea how though...
Anyway, amending this back to RAID and restarting means Windows boots as normal.
Many thanks for all the help and advice. Turned out to be a two second fix. Apparently this is the most common cause for the "Missing Operating System" message, so anyone else, look here first!