Completely Remove W23.Blaster.Worm with the help of Crystallinepk
Step 1:
IF your OS is Windows XP/ME, then Right-click on My Computer -> Click System Restore tab -> make it checked 'Turn Off System Restore'
Step 2: Download FixBlast.exe and Security Patch File at (C:\ or D:\)

Step 3: Restart your computer in Safe Mode & Run FixBlast.exe
Step 4:
Restart your computer in Normal Mode & run Security Patch File
Step 5:
Further Technical Descriptions & Demonstrations on Removing this Worm:
http://www.computercops.biz/article2723.html
http://www.cert.org/advisories/CA-2003-20.html

http://securityresponse.symantec.com/avcenter/venc/data/w32.blaster.worm.removal.tool.html