It is an error that will stop windows or Vista to stop working, I've had it myself a few times..sucks, it makes your internet really slow..kind of like a virus
The HangB1 keeps you from logging into Facebook because it is spam. Try uninstaling it and then report it for spam.
To stop AppHangB1:Step 1:Check the status of the issue in safe mode (safe mode with networking if this happens while browsing Internet).Step 2:If the issue does not occur in safe mode or safe mode with networking then place the computer in clean boot state and check if helps you fix this issue.How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7:1. Click Start, type msconfig in the Start Search box, and then press ENTER.If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.2. On the General tab, click Selective Startup.3. Under Selective Startup, click to clear the Load Startup Items check box.4. Click the Services tab, click to select the Hide All Microsoft Services check box, and then click Disable All.5. Click OK.6. When you are prompted, click Restart.7. After the computer starts, check if the issue is fixed.