So do you have "Yahoo browser" as well as Chromium?
Regardless, when either of them is running, press Control + Shift + Escape (the three keys at once). It will bring up the task manager. Go to the Processes tab.
Within the top menu, there is an Options/View menu (sorry, I do not have it here at the moment) with an option to "Select columns" or something similar. Select it. Tick "Command line".
That should give you the precise location (along with some parameters) of the application. Kill the process first and then delete its folder. That should get rid of it, I guess.
Good luck.
If that does not work, you should check out some actual malware support forum, as this group is not a technical support group - and surely not one for malware issues.