I use XP and TI2010. MBR Error 3 shows up on startup, but the computer seems to run normally. I have backups of Drive C on external HD going back several months. My primary disk is split into Drive C and Drive I, (for Try and Decide). All data is on the slave disk D. Can I restore just the MBR from a previous backup, and would this cure the problem? The primary disk was partitioned two years ago.