I already install win 8.1 32bit but now i want to install 64bit...how can i..?

i have hp7800 convertible system...having
ram : 2gb
processor: intel DUAL CORE E2200 2.20 GHz
System type: now 32bit operating system..x64 based processor
i already used WINDOW 8.1 PRo 32bits
but want to install 64bits..when i click on 64bits setup one message displayed...
THIS APP CAN'T RUN ON YOUR PC
TO FIND a VERSION FOR YOUR PC,CHECK WITH THE SOFTWARE PUBLIsHER..
i think i meet all the requirements but can't be able to install 64bits..
Please HELP how to INSTALL windows 8.1 64bits. on this SYSTEM
THANKS

Hi,
It seems we cannot run 64bit setup in 32bit system.
Please boot from your installation media to install Windows 8 64bit.
Alex Zhao
TechNet Community Support

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