make sure you update both after you install them, then just do a full scan, and you should be good to go... assuming you shut off your windows messenger. if you havent, follow these instructions to shut off windows messenger:
Make sure your Internet Explorer, Outlook Express, Windows Messenger and other programs are closed before doing this.
1) Click on Start, Run
2) Type the following (or cut and paste it) into the Run line
(1) Select "Start"
(2) Choose "Control Panel"
(3) Choose "Administrative Tools"
** note in Windows XP Home edition, Admistrative Tools is in Performance and Maintence
(4) Choose "Services"
(5) Right-click on "Messenger"
(6) Select "Stop"
To permanently disable Messenger:
(7) Right click "Messenger"
(8) Select "Properties"
(9) Change "Startup Type" to "Disabled" and click "OK"