The W595 does not support this functionality but you can do a master reset.
To master reset Sony Ericsson W595
1. From Standby select Menu > Settings > General tab > Master reset.
2. Select an option.
3. Follow the instructions.
Check Update service here http://www.sonyericsson.com/cws/support/softwaredownloads/detailed/updateservice/w595?cc=gb&lc=en
or
If nothing works: As last resort do a Sony Ericsson phone repaire with PC Suite. Use this method to hard reset AFTER INSTALLATION----> TOOLS > PHONE REPAIR

http://www.sonyericsson.com/cws/support/softwaredownloads/detailed/pcsuite/aino?cc=gb&lc=en

