Pscript.dll
Pscrptui.dll
Pscript.hlp

http://support.microsoft.com/default.aspx?scid=kb;EN-US;142057
http://support.microsoft.com/default.aspx?kbid=142057

Both of these sites will help out!
Pscrptui.dll & pscript.dll
You can get these files here, this is the search page and seem to be available, however, the help file is not.
http://support.microsoft.com/default.aspx?scid=http%3a%2f%2fsupport.microsoft.c om%2fservicedesks%2ffileversion%2fdllinfo.asp&fp=1