The reason mem suggested a different IP address is that google has done some rearranging of their server network, and 64.233.187.99 doesn't work for direct end user access anymore.
Running a host www.google.com returns some alternatives:
www.google.com is an alias for www.l.google.com.
www.l.google.com has address 66.102.7.99
www.l.google.com has address 66.102.7.103
www.l.google.com has address 66.102.7.104
www.l.google.com has address 66.102.7.105
www.l.google.com has address 66.102.7.106
www.l.google.com has address 66.102.7.147
66.102.7.103 worked for someone who asked about this the other day.
Ran