Hi,
You can open Internet Explorer, Press ALT+H, and then click About Internet Explorer
to check the version.
If it showed "64bit Edition", you are using the 64 bit version. If not showed, you are using 32bit version.
You can also refer to the following articles:
Find out which version of Internet Explorer you're using
Q&A: 64-Bit Internet Explorer
Hope this helps.
Vincent Wang
TechNet Community Support
