You can only install 32bit Opus on a 32bit version of Windows, and can't have two installs in parallel (any 2nd install would just replace the 1st one).
It's really unlikely to be due to the Opus installation or configuration, but if you want to rule them out then the steps I mentioned above should be quick to perform, and you can choose whether or not to keep your existing config and when to restore it from a backup if you wish to try with a fresh config.
The suggestions in Crash, exit or high CPU usage when viewing certain directories and General slowdown or instability investigation steps are also worth considering.