Do to this posting (http://www.pcworld.com/businesscenter/article/150637/google_amends_chrome_license_agreement_after_objections.html) regarding the perpetual copyright granted to Google in section 11, the license allowed the company to "make such Content available to other companies, organizations or individuals with whom Google has relationships for the provision of syndicated services, and to use such Content in connection with the provision of those services." (they are removing) and for the fact that Chome does not require Administrator rights for installation here is a useful method for blocking...

Block execution of the EXE using a hash rule Software Restriction Policy GPO.
Software Restriction Policies How To...
http://technet.microsoft.com/en-us/library/cc782430.aspx
Create a hash rule
http://technet.microsoft.com/en-us/library/cc781507.aspx