I_Love_My_Vans,

uninsneveruninstall
Never uninstall this file. This flag should be used sparingly, and is usually used in combination with the onlyifdoesntexist flag. It is meant to be used when installing a very common shared file, such as CTL3DV2.DLL or an MFC DLL, because you wouldn't want the uninstaller to delete the file since other applications make use of it also.

Look in Inno Setup's help section under [Files] for a complete listing of Flags that can be used in the Files Section.