Hi,
Try cleaning up the installer.
Start/run services.msc, scroll down to "Windows Installer" and double click
it. Stop the service if it is running, set the startup type line to
disabled. Click apply/ok and reboot.
Delete the contents of the temp folders, there may be a file in there
interfering with the setup routine of the installer. Get both:
C:\Windows\temp
C:\Documents and Settings\<username>\local settings\temp
Now reverse the first set of steps and reenable the Windows Installer (You
can just set the startup type to manual). Reboot.
Turn off all other running programs, especially your antivirus software. Use
ctrl+shift+escape, if necessary, to "end task" on everything.
Now retry installing some software. If it doesn't help, here are some
further articles that may:
"Error 1719. The Windows Installer Service Could Not Be Accessed" Error
Message When You Try to Add or Remove a Program
http://support.microsoft.com/?kbid=315346
Windows Installer Error 1619 When You Install from NTFS-Protected
Directories
http://support.microsoft.com/?kbid=316309
OFF: "The Windows Installer Service Could Not Be Accessed" Error Message
When You Try to Install Office
http://support.microsoft.com/?kbid=324516
--
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Associate Expert - WindowsXP Expert Zone
Windows help -
www.rickrogers.org