Delphi's Help keeps crashing

Hi all,

        I have a problem with Delphi's help. Whenever I hit F1 in a blank
space I get an access violation, then the search all box comes up, for
every key I press I get another access violation and on the third
Delphi crashes. I have reinstalled Delphi twice, taken the winhelp and
winhlp32 exe's files from another computer in case these wear
corrupted. Deletec all the gid files and rebuilt the search database
of each help file.... I just cant seem to stop this happening...
please help!

Thanks in advance

Simon