I've got the same Error 1001 last week while installing the PC Monitor on my computer. I didn't have or I'm not sure about InstallShield or something. I just learned that some programs comes with built-in InstallShiedl and maybe PC Monitor is one of it. There are missing files that needs to be re-regitered. The solutions from the link below somehow helped me.
http://www.techyv.com/questions/error-1001-installutilibdll-unknown-error-pc-monitor-installation