"Could not load file or assembly 'CrystalDecisions.Web, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304' or one of its dependencies. The system cannot find the file specified."

Error message show when try to deploy web application to 64 bit Windows server 2008 R2 server. 
"Could not load file or assembly 'CrystalDecisions.Web, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304' or one of its dependencies. The system cannot find the file specified."

This is not easy for us to debug because we already install crystal report runtime in the server. But wait ... what is the problem then? version? yes, the version for the runtime installed is 10.5.3700.0 which i get from my machine:
C:\Program Files\Microsoft SDKs\Windows\v6.0A\Bootstrapper\Packages\CrystalReports10_5. 

So, how to get crystal report runtime 10.2.3600.0 version? We can download from http://resources.businessobjects.com/support/additional_downloads/runtime.asp#07

So, beware of the different version of crystal report runtime. Hope this help