What is vtpatternsystems40.nsl.dll doing on my computer?
vtpatternsystems40.nsl.dll is a VTPatternSystems40.nsl.dll
belonging to VisualTrader 4.0
from Nirvana Systems, Inc.
Non-system processes like vtpatternsystems40.nsl.dll originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.