Satellite C660 - How to change from 32 bit to 64 bit operating system?

Can some one please tell me how to change from a 32 bit to a 64 bit operating system for my Toshiba Satellite C660 Notebook?
No cds came with my notebook so I can't restore.
I installed the 32 bit when setting up by mistake and would now like to change.
Thanks in advance

>No cds came with my notebook so I can't restore.
In user manual you could find a info that recovery disk needs to be created using preinstalled software called Toshiba Recovery Media (disk) Creator
>I installed the 32 bit when setting up by mistake and would now like to change.
The Toshiba image of some notebook models contains the Win 7 32bit and 64bit system.
Not sure if your image supports both versions so cannot say for sure if you would be able to switch to 64bit but try this:
http://aps2.toshiba-tro.de/kb0/HTD1303440001R01.htm
During HDD recovery procedure you should be asked what version you want to chooseof course if both versions would be available so check thisotherwise you will need to purchase an 64bit version.

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