Recently a problem appeared on my computer. I dunno why, but every time I try to call a task manager in any way computer shows error message: ["Windows cannot find 'C:\Windows\system32\taskmgr.exe'. Make sure you typed the name correctly, and then try again."] But when I go to C:\Windows\system32, I can see taskmgr.exe, but opening it triggers the same error. I tried to copy taskmgr.exe file from another computer, in which it worked, but it still doesn't run on my computer. Before this problem started I defragmented the disk and messed with Advanced SystemCare Pro a bit, so maybe that is what caused this problem, or maybe it is some kind a virus. I'm running Windows 7 64x, using Kaspersky internet security. I looked around a internet a bit, but I haven't found any solutions for this kind of problem yet So, can anyone help?