It is Win 8 correct ?
Remove :
McAfee Security Center
Yahoo Toolbar
The two programs you have installed also should be removed...
Download AVG :
http://download.cnet.com/AVG-AntiVirus-F...&tag=buttonChoose the free version not the trial, when asked allow permissions, do a full in-depth system check / should be automatic when first installed... The remaining crapware if real spyware or adware will be identified and quarantined - if you want you can uninstall listed offenders from the control panel.
If it were Win7 i'd suggest removing most of the dell utilities but as its win8 I am not sure what is safe to remove and what should be left in place.
This is the same procedure I've used with a couple of toshibas we bought this Christmas and worked like a charm.
Second option is to do a screenshot of your installed programs list and I'll list the offenders...
Best Regards