How can I protect myself from virii and such?
Always write protect your floppy disks when you are not purposefully writing to them. Use ATTRIB to make all of your EXE and COM files read only. This will protect you from many poorly written viruses. Scan any software that you receive with a recent copy of a good virus scanner. The best virus scanner currently available for DOS is F-Prot by Fridrik Skulason. The current version is FP-212C. It is best to use more than one virus scanner. That will decrease your chances of missing a virus. Backup regularly, and keep several generations of backups on hand. If you always backup over your last backup, you may find yourself with an infected backup tape.