NUP.SYS Application/Process Description Below is a description of NUP.SYS. This application may not be safe to have on your computer. If this application is running on your computer, it is advised that you scan your computer for both viruses and spyware/adware immediately. Click here to download SUPERAntiSpyware to block and remove NUP.SYS and thousands of harmful applications.     Summary of NUP.SYS Rootkit.Agent/Gen-NUPSpamTools.Process   Company Information Unknown   Description of NUP.SYS Rookit that may log user information and possibly block access to certain security related sites. Trojans are programs that can appear to serve a legitimate purpose but actually have an unwanted or harmful effect. A large segment of trojan programs download other harmful software components to a user's PC without his/her knowledge. This application is most likely downloaded and installed by another application that is considered to be adware or spyware.   Threat Level (1-10) 5   Processes NUP.SYS   CLSID List Click here to go back to the application list