You should try and understand the slave_mysql_log.txt file ..
100909 11:11:48 [ERROR] Slave SQL: Error 'Duplicate entry '693' for key 'PRIMARY'' on query. Default database: 'web2project'. Query: 'INSERT INTO `user_access_log`(`user_id`,`date_time_in`,`user_ip`) VALUES ('1',NOW(),'192.168.0.37')', Error_code: 1062
Looks pretty straight forward to me ..
you're replication is inconsistent and needs to be setup all over again ..
stop slave on pc2
lock tables on pc1
read master log pos on pc1
mysqldump from pc1
unlock tables on pc1
import mysqldump in pc2
set masterlog pos on pc2
start slave on pc2