Hi Dushan,
I would like to answer following questions.
Yes, that does make sense Pete, so what if I accidentally deployed 32 bit SEP client to the whole 64 bit workstation ?
--> It won't get deployed, you will have to install 32bit package on 32 bit operating system.
are they going to work as normal ?
--> you will have to install 64 bit clients package difference would be in SEP functionality.
Symantec Endpoint Protection 11.0 compatibility with 64-bit platform
http://www.symantec.com/business/support/index?page=content&id=TECH102143
What are the difference between 32 bit and 64 bit client?
--> Difference is as mentioned above i.e. functionality.
As everyone suggested SEP 11.0.5 (RU5) and later version is compatible with WIN 7.