My Windows Installer has stopped functioning - cannot install or uninstall programs - I get a dialogue box message: "The Windows Installer Service could not be accessed. This can occur if you are running Windows in Safe mode, or if the Windows Installer is not correctly installed. Contact your support personnel for assistance". I have Windows XP Home Edition Version 2002, Service Pack 3. It's been operating OK for years, now this. I've had an Office validation issue, but it's now sorted. Also, on boot up I get a Windows Recovery message: "One of the files containing the system's Registry data had to be recovered by use of a log or alternate copy. The recovery was successful." Not sure if there's a connection. Any ideas?