Tip #2: Don't open attached files you aren't expecting, even if you know the person who sent them. If in doubt, call or write the person to make sure it's a legitimate file.
Tip #3: Don't send attached files unless it's really necessary.
Tip #4: Don't download files from Web sites unless you're sure the site is reputable.
Tip #5: Keep an up-to-date backup of your data files.
Tip #6: Keep a copy nearby of your Windows setup CD and CDs for all your important programs. Also keep serial numbers and CD-keys on file in case you need to reinstall.
Tip #7: If you are running Windows 95 or Windows 98, consider getting a copy of GoBack, which can get you out of virtually any trouble you find yourself in.