Need Help With Webmail Plus

I have gone through the pain of installing this great module (and all it's mammoth dependencies), carefully following the instructions, but I ended up with these mysql errors :

* user warning: Table 'wharcdb.webmail_plus_user_passwords' doesn't exist query: SELECT password FROM webmail_plus_user_passwords WHERE uid=1 in D:\htdocs\wharc-online.org\sites\all\modules\webmail_plus\webmail_plus.module on line 2105.

* user warning: Table 'wharcdb.webmail_plus_user_headers' doesn't exist query: SELECT COUNT(*) AS count FROM webmail_plus_user_headers WHERE uid=1 AND folder='INBOX' in D:\htdocs\wharc-online.org\sites\all\modules\webmail_plus\webmail_plus.module on line 1285.

* user warning: Table 'wharcdb.webmail_plus_user_passwords' doesn't exist query: SELECT password FROM webmail_plus_user_passwords WHERE uid=1 in D:\htdocs\wharc-online.org\sites\all\modules\webmail_plus\webmail_plus.module on line 2105.

* warning: imap_open() [function.imap-open]: Couldn't open stream {mail.wharc-online.org:143}INBOX in D:\htdocs\wharc-online.org\sites\all\modules\mail_api\contrib\imapwu_api\imapwu_api.module on line 73.

* warning: imap_status(): supplied argument is not a valid imap resource in D:\htdocs\wharc-online.org\sites\all\modules\mail_api\contrib\imapwu_api\imapwu_api.module on line 93.

* user warning: Table 'wharcdb.webmail_plus_user_headers' doesn't exist query: SELECT COUNT(*) AS count FROM webmail_plus_user_headers WHERE uid=1 AND folder='INBOX' in D:\htdocs\wharc-online.org\sites\all\modules\webmail_plus\webmail_plus.module on line 2042.

* user warning: Table 'wharcdb.webmail_plus_user_headers' doesn't exist query: SELECT * FROM webmail_plus_user_headers WHERE uid=1 AND folder='' in D:\htdocs\wharc-online.org\sites\all\modules\webmail_plus\webmail_plus.module on line 1560.

What could be wrong, how do I fix this ??