Adware:Adware (or spyware) is a small program that is designed to show advertisements (in various form and degrees of intrusiveness) on your computer. It often reports personal information back to its owners. As a result your sense of privacy can be violated.
Trojan.Downloader-RA is a spyware Trojan created to hijack and infect your personal computer. Once executed, Trojan.Downloader-RA will open up a huge security hole on your system and may install additional malware. Trojan.Downloader-RA may also give access of your entire system for a remote attacker. Trojan.Downloader-RA is a serious threat to the security and privacy of your sensitive personal information and is recommended to be removed immediately.
Technical details (How to remove Trojan.Downloader-RA(pop up))