Replacing SpySweeper

Hello,

I am new to this forum and have a couple of questions.
My subscription to SpySweeper is about to expire and I would like to replace SpySweeper with SpyBot, everything I have read about SpyBot is positive.

My questions are:
should I remove SpySweeper before downloading SpyBot and is the WindowsXP add/remove programs function sufficient to remove SpySweeper?

I read in your compability section that there was concern about Norton and SpyBot. I have Norton systems work as well as their antivirus. Do you think I will be OK if I continue to use Norton after installing SpyBot?

Thanks for your help

Jim