InstallShield is a program that installs software on your computer. It's the program that asks where to install the new software, asks you to agree to the EULA, etc. After a successful installation, it usually deletes all temporary files it used during the installation.
Perhaps it's in the Recycle Bin because the installation wasn't successful or something on your computer prevented it from completely deleting the files it used.
XP home SP2
Just found InstallShield Installation Information program in my recycle bin with no memory of deleting it. I returned it to the program files. Is it essential and what in fact does it do?