Can you please elaborate a bit more? If I understand correct, you ran the 64 bit requestRouter MSI on 32 bit system and MSI failed with blank error message?
Please let me know what OS and SKU you are trying this install on and what version of "application request router" you are trying to install?
I tested installing 64 bit ARR V2 RC on 32 bit Win2k8 SP2 but got the right error message - "This installation package is not supported by this processor type. Contact your product vendor." as expected.