Finally solved the problem. It has nothing to do with the sound card or software--it's my aging computer. While at the time it was purchased, which was about seven years ago, the 933-mhz Intel III process was top of the line, this is no longer the case, especially when running Windows XP-Pro. The processor is so overburdened that I cannot handle multi-tasking projects using sophisticated software--even with all the startup files disabled. So, it's time to buy a new desktop computer, something that will handle the latest software without glitches. If I were not so accustomed to using the PC, and all the programs available for PC, I would probably be switching to a Mac. But, even they have problems.

Thanks guys,

Gary