Traditional modems use telephone lines.
Can be checked in the System icon in the Control Panel by selecting the Performance tab. What MS-DOS Compatibility Mode means is that you will have overall slower system performance. Your computer goes into this mode because of several reasons, including a virus, a memory-resident program, a problem with your hard disk controller, or a driver problem. Refer to techmommy's Frequently Asked Computing Questions for help with recovering from MS-DOS Compatibility Mode. All rights reserved.