Hi,
You need to remove McAfee completely and get Windows Defender started again as 3rd party AVs disable Windows Defender (which is an Anti-virus) by default and do a thorough scan of your machine for Malware.
Use the McAfee Removal Tool.
https://service.mcafee.com/FAQDocument.aspx?id=TS101331
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How to restart Defender:
https://www.winhelp.us/configure-windows-defender-in-windows-8.html
If you've previously uninstalled a third-party antivirus product (avast!, AVG, Norton/Symantec, McAfee or some other product), you might see a dialog that states that Windows Defender is turned off. In that case, either click Action Center's white flag
icon in
Taskbar Notification Area (aka System Tray) and click
Turn on virus protection (Important) or Turn on spyware protection (Important), or open Control Panel (Windows Key+X has a nice shortcut), type action into Search field, click
Action Center and then click one of the Turn on now buttons in Security section.
Please note that Action Center might have no red warning icon for several days after you've removed a third-party virus protection tool.
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Scan for Malware:
Download, install, update and scan your System with the free version of Malwarebytes AntiMalware and if necessary do this in Safe Mode with Networking:
http://www.malwarebytes.org/products/malwarebytes_free
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And also Scan with the free version of SUPERAntiSpyware
http://www.superantispyware.com/download.html
SUPERAntiSpyware Free Edition is 100% Free and will detect and remove thousands of Spyware, Adware, Malware, Trojans, KeyLoggers, Dialers, Hi-Jackers, and Worms. SUPERAntiSpyware features many unique and powerful technologies and removes spyware threats
that other applications fail to remove.
SUPERAntiSpyware Free Edition does not include real-time blocking or scheduled scanning.
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This is a very good Program to scan your System to remove Adware, etc:
http://www.bleepingcomputer.com/download/adwcleaner/
AdwCleaner is a program that searches for and deletes Adware, Toolbars, Potentially Unwanted Programs (PUP), and browser Hijackers from your computer. By using AdwCleaner you can easily remove many of these types of programs for a better
user experience on your computer and while browsing the web.
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And just to be sure nothing is lurking in the background:
"TDSSKiller Rootkit Removal Utility Free Download"
http://usa.kaspersky.com/downloads/tdsskiller
Cheers.
