Invalid page fault

After reinstalling windows 98 and office 2000 I can't use
outlook-when I try to open it I get the message "this
program has performed an illegal operation and will be
shut down", the details say "invalid page fault in module
gapi32.dll". Everything else is working fine (windows,
word, excel, etc)but I did recently have trouble with
windows and had to replace my config.sys file. Does this
error message sound like it is related to the config.sys
file problem?