It really tooks a long way to locate this bug in VMware! E.g.: the 'undefined' error comes up if you have the 'LogInstallation' flag in 'useroptions.js' disabled and choose only one menu entry containing the %reboot% command: config.js ... pn=1; prog[pn]=['APP 1 - Reboot']; ordr[pn]=[101]; desc[pn]=['Test APP 1']; uid[pn]=['APP1']; dflt[pn]=['yes']; cat[pn]=['System']; forc[pn]=['no']; cmd1[pn]=['"%wpipath%\\Install\\APP_1.cmd" %wpipath%\\']; cmd2[pn]=['%reboot% 10']; pn++; prog[pn]=['APP 2']; ordr[pn]=[102]; desc[pn]=['Test APP 2']; uid[pn]=['APP2']; dflt[pn]=['yes']; cat[pn]=['System']; forc[pn]=['no']; cmd1[pn]=['"%wpipath%\\Install\\APP_2.cmd" %wpipath%\\']; pn++; ... The machine reboots and then 'Installer.hta' throws an 'undefined' error and terminates: Installer.hta ... // Check for ResumeInstall registry entries try { CurrentInstall=WshShell.regRead("HKEY_CURRENT_USER\\Software\\WPI\\CurrentInstall"); LastExec=WshShell.regRead("HKEY_CURRENT_USER\\Software\\WPI\\LastExec"); LastTopLine=WshShell.regRead("HKEY_CURRENT_USER\\Software\\WPI\\LastTopLine"); Language=WshShell.regRead("HKEY_CURRENT_USER\\Software\\WPI\\Language"); // ===> LogPath[0]=WshShell.regRead("HKEY_CURRENT_USER\\Software\\WPI\\LogPath"); // ===> this line throws 'undefined' if the REG entry does not exist !!! // ===> then WPI exits numCommands=WshShell.regRead("HKEY_CURRENT_USER\\Software\\WPI\\numCommands"); curCommand=WshShell.regRead("HKEY_CURRENT_USER\\Software\\WPI\\curCommand"); } catch (ex) { alert(getText(UnableToResumeInstall)); try { WshShell.regWrite("HKEY_CURRENT_USER\\Software\\WPI\\ResumeInstall",0,"REG_DWORD"); } catch (ex) {;} ExitWPI(); } ... The solutions is quite simple: writing the REG 'LogPath' entry by default: WPI.hta ... <script type="text/javascript"> try { WshShell.regWrite("HKEY_CURRENT_USER\\Software\\WPI\\Theme",Theme,"REG_SZ"); WshShell.regWrite("HKEY_CURRENT_USER\\Software\\WPI\\Language",Language,"REG_SZ"); WshShell.regWrite("HKEY_CURRENT_USER\\Software\\WPI\\PlayAudioInInstaller",PlayAudioInInstaller,"REG_SZ"); WshShell.regWrite("HKEY_CURRENT_USER\\Software\\WPI\\AudioVolume",Volume,"REG_SZ"); // ===> insert the following line // ===> to fix WshShell.regWrite("HKEY_CURRENT_USER\\Software\\WPI\\LogPath",LogPath,"REG_SZ"); // ===> } catch (ex) {;} </script> ... Also the 'undefinied' message - when installing Office2003 - is gone... That's it - I hope you like it