tape backup problem

Using Colorado Backup software and a Colorado T1000 tape drive I attempted a full system backup. After 30 minutes I received the message that the memory manager had experienced a serious error. Reinstalling hardware and software did not solve the problem. The system also became unstable (again!); blue screens, etc. I 'recovered' by copying system.1st to system.dat. Windows95 runs ok now, but I have trouble every time I boot windows95. Eventually I get a message about loading the register from backup and that results is a successful boot. I am willing to give up on the tape backup, but I would like to  solve the bootup problems.

Thanks for your assistance