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.Crypt.XPACK is a malicious Trojan parasite that infiltrates your computer system via security exploits. Once installed on your PC, this Trojan will create a security-free gateway on your system and will proceed to download and install additional malware without your authorization. Trojan.Crypt.XPACK also enables a remote hacker to take complete control of your computer. This malware can log your typed keystrokes and send confidential personal and financial data (including banking information, credit card numbers, and website passwords) to a remote hacker.
Technical details (How to remove Trojan.Crypt.XPACK(pop up))