Free Antispyware Software
It is highly recommended that every computer has an anti malware program installed on their computer. Malware can definitely be the cause of the 400 Bad Request error. From our experience Reimage is probably the best Antispyware program available at such a low price on the online market today:

Reimage Antyspyware Features
- Detects and repairs a large range of spyware
- Maintains user data integrity
- Fixes damaged or missing windows components
- Downloads missing files deleted by spyware.
- Daily updates of virus definitions in automatic mode
- Easy to use: install and sit back while ReImage protects your computer
- Fixes the 400 Bad Request error.
