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.
Worm.Nucrypt.gen is a worm that spreads via IRC, browser security loopholes and network shares. This worm is employed by malicious hackers to create a backdoor on your system, which will allow a remote hacker to take control of your machine and use it for malicious purposes, including personal and financial data theft and further infection of your system with additional malware programs. This threat should be removed from your system immediately.
Technical details (How to remove Worm.Nucrypt.gen(pop up))