Try going to Web site of your program vendor (Sharp Fax) and search its
knowledge base for known issues. There could be many problems that prevent
you from sending fax successfully:
1) Your modem does not support fax capability
2) Incorrect hardware configuration
3) Something wrong on the other end (where you want to send your fax to)
etc
You should provide more details to help us solve your problem (like whether
modem makes any sounds, whether you can connect to the Internet using your
modem, etc)
Regards,
Yuriy