Xp hangs

Reboot computer in safe mode by pressing f8 key at boot. Select safe mode. Run your spyware removal program to clean of spyware. Then run your antivirus to check for and clean viruses. After complete restart computer normally. If it boots to desktop and can access the internet, update your virus scan and run another scan & clean. If this does not work boot computer with your xp cd, select r for repair console. At the dos prompt type fixboot then hit enter, and y. Then type exit to reboot. If that does not work reboot with cd same steps as before except type chkdsk c: /r  and ht enter. After done exit to restart.

Hope this helps... please comment if further assistance is needed