Post install shield 11, the IDE would not successfully launch when run by a non-administrator and would display following error.
"InstallShield has not been initialized. InstallShield must be run at least once by a user with Administrator or Power User privileges. "
A bit of registry tweaking could help in finding solution to this problem.
All you need to do is add a key "ProjectTemplatesUpToDate" ( dword ) with value 00000001 in the following location
[HKEY_CURRENT_USER\Software\InstallShield\11.0\Professional\Project Settings]
Now you will be all set.