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#1
Where did you get it from, what is it supposed to be for, did you install it or just download it?
Don't know what that is. I cannot find search results for "Sykkerda"...
Next time, as long as the "unins" file is not infected (check it by uploading it to the VirusTotal website), then use that file to properly remove that application (which would remove registry entries, if the app creates any) which would still exist in your Registry if you manually deleted the files instead.
Probably would've been better off using a dedicated uninstaller (like freeware RevoUninstaller) to see if it's "officially" listed as installed, and then uninstalling it (and all its leftover bits and pieces) rather than just delete the one (obvious) folder.
inference engine has AI connotations
libgles libglesv2.dll - What is libglesv2.dll?
QBXMLRP ... Quickbooks dll file
Don't Delete the folder, but if the app is not in the Program and Features then the Unis000 in that folder Is the Uninstall file. Of course an Uninstaller App, like Revo's Advanced mode would remove all Registry traces as well.