Thank you AVAST team!!
I have downloaded and installed Avast 6.0.1091 on both of my Dell's. One was still Avast 5.0 and the other was Avast 6.0.1000. They both installed perfectly. Both were downloaded over the other program, not a clean install. No problems with WMP 11 on either. Then I installed the latest free ZoneAlarm on my desktop Dell with no problems.
I am very pleased. Thank you for offering this software to home users for free.
Becky
Upgraded my mom's emachine XP home x64, with free, avast 6.0.1091. Went smoothly, no problems, WMP 11, no problems. It is well worth the wait. Thanks Avast! You are appreciated.