How to delete .class files?

[Jipple]

Hi when i first downloaded osbot I used winrar to exstract the files, then later found out I needed java installed.I got osbot working fine but its annoying having a folder i csn not delete xd, I tired every thing on google/youtube, maybe theres somthing I am missing, I am about to reset my pc but its remote so it more of a hastle to reset.

 

When trying to delete the osbot winrar folder it deletes everything except .class files 

When i try to delete them its says files not longer exist plz help thanks.

[Gunman]

Restart the system

 

[Khaleesi]

Just a visual glitch I guess

[Jipple]

I have tried & booted in safemode ect, I guess its not a big problem.