Donna thank you for the "heads up"
Your's is a very helpful post. Ann
Check this page of Microsoft http://support.microsoft.com/kb/935796 entitled "Information about programs that are known to experience a loss of functionality when they run on a Windows Vista Service Pack 1-based computer" before you allow installation of SP1. Make sure you check with the vendor of your program whether their software has no more issue with Vista SP1.
Today, the article shows below programs are blocked from starting after you install Windows Vista SP1:
BitDefender AV or Internet Security
Fujitsu Shock Sensor
Jiangmin KV Antivirus
Trend Micro Internet Security
Zone Alarm Security Suite
Then below programs do not run when you install Vista SP1:
Iron Speed Designer
Next is.. Programs that have a loss of functionality after you install Windows Vista SP1:
Rising Personal Firewall
Novell ZCM Agent
Please read the said article for more information.