Adware (Advertising Software) is a software application in which advertisements are displayed while the program is running, especially in pop-up windows or banners, and is often installed without the user's knowledge or consent.
Spyware (Spying Software) is any software that covertly gathers information about a user while he/she navigates the Internet and transmits the information to an individual or company that uses it for marketing or other purposes.
Malware (Malicious Software) is software, such as viruses, intended to damage or disable a computer system. Malware often work in conjunction with Adware.
PC Tools to Consider
Malwarebytes - Make sure database is updated and perform a full scan
C:\Users\%username%\AppData\Local\Microsoft\Windows\Temporary Internet Files
Note - some items may not let you delete them. You can try again or click on Skip when deleting. Also, to see the AppData folder you will need to go to Folder Options and click on View Tab. Put a mark next to “Show hidden files, folders, and drives” and “Hide protected operating system files”.
Open up Control Panel and go to Programs and Features. Uninstall all unnecessary applications. For example uninstall all toolbars and any games.
Empty out Recycle Bin.
Check current AV to see if anything is quarantined.
Open up System Configuration and choose Startup tab. Uncheck anything that looks suspicious. If you are unsure about an item, Google it to see if it’s legit or not.
Uninstall any old AV or Malware scanning software that’s not needed.
Open up Task Manager. Under Processes, if there is anything suspicious then click on End Process for it. If you're unsure, Google the process to confirm if it’s legitimate or not.
Check the following directories on a windows 7 OS for anything suspicious:
C:\Windows\System32 -View by date which will help narrow done searching