[Luxor144]

I'm asking for help because my computer have some kind of a problem. Whenever I try to run regedit or task manager, I get an error: [Windows cannot find 'C:\Windows\regedit.exe'(or \system32\taskmgr.exe if I try to run task manager).Make sure you typed the name correctly, and then try again.] Even when I go to C:\Windows\system32 and double click on taskmgr.exe file I still get the same problem, so I think this is some kind of virus. Karspersky and AVG found nothing. I also recently downloaded ArcaClean.exe program, some kind of virus remover in hope that it will find anything. I started scanning with that program, but it closed by itself after some time. I tried again and again , but the program seems to be closing randomly durning scaning. Maybe it's some fault in a program, or a defence mechanism in a virus. Anyway I'm kinda out of ideas, so I'm asking for help in here.

Oh, by the way here is tasklist from cmd, maybe it will help something:
System Idle Process --- 0 Services - 0 - 24 K
System --- 4 Services - 0 - 100.796 K
smss.exe --- 268 Services - 0 - 684 K
csrss.exe --- 360 Services - 0 - 3.536 K
wininit.exe --- 416 Services - 0 - 3.368 K
csrss.exe --- 424 Console - 1 - 6.184 K
winlogon.exe --- 460 Console - 1 - 5.376 K
avgchsva.exe --- 496 Services - 0 - 24.232 K
avgrsa.exe --- 504 Services - 0 - 1.380 K
services.exe --- 536 Services - 0 - 6.836 K
lsass.exe --- 544 Services - 0 - 8.692 K
lsm.exe --- 552 Services - 0 - 3.196 K
svchost.exe --- 660 Services - 0 - 7.268 K
nvvsvc.exe --- 720 Services - 0 - 3.532 K
svchost.exe --- 760 Services - 0 - 6.916 K
svchost.exe --- 888 Services - 0 - 16.188 K
svchost.exe --- 924 Services - 0 - 84.796 K
svchost.exe --- 964 Services - 0 - 27.800 K
audiodg.exe --- 368 Services - 0 - 16.464 K
svchost.exe --- 1040 Services - 0 - 10.348 K
avgcsrva.exe --- 1112 Services - 0 - 22.816 K
svchost.exe --- 1168 Services - 0 - 29.432 K
nvvsvc.exe --- 1184 Console - 1 - 5.520 K
spoolsv.exe --- 1420 Services - 0 - 8.500 K
svchost.exe --- 1476 Services - 0 - 11.592 K
taskhost.exe --- 1484 Console - 1 - 8.716 K
dwm.exe --- 1560 Console - 1 - 26.812 K
svchost.exe --- 1656 Services - 0 - 5.512 K
avgwdsvc.exe --- 1724 Services - 0 - 2.732 K
taskeng.exe --- 1080 Console - 1 - 5.232 K
CDAC11BA.EXE --- 1416 Services - 0 - 2.340 K
SMSvcHost.exe --- 1324 Services - 0 - 4.868 K
AWC.exe --- 1732 Console - 1 - 2.140 K
avgnsa.exe --- 2068 Services - 0 - 2.344 K
ShutdownService.exe --- 2264 Services - 0 - 4.332 K
sppsvc.exe --- 2332 Services - 0 - 4.752 K
nvSCPAPISvr.exe --- 2364 Services - 0 - 3.632 K
svchost.exe --- 2388 Services - 0 - 4.364 K
svchost.exe --- 2416 Services - 0 - 6.544 K
avgemc.exe --- 2440 Services - 0 - 1.696 K
avgcsrvx.exe --- 2492 Services - 0 - 4.116 K
daemon.exe --- 2936 Console - 1 - 23.856 K
bittorrent.exe --- 2948 Console - 1 - 35.068 K
avgtray.exe --- 3032 Console - 1 - 3.160 K
svchost.exe --- 3708 Services - 0 - 6.396 K
w3wp.exe --- 1540 Services - 0 - 8.540 K
firefox.exe --- 1364 Console - 1 - 224.804 K
explorer.exe --- 1744 Console - 1 - 87.524 K
ArcaClean.exe --- 4792 Console - 1 - 12.400 K
cmd.exe --- 6080 Console - 1 - 2.848 K
conhost.exe --- 5000 Console - 1 - 5.496 K
tasklist.exe --- 5024 Console - 1 - 5.108 K
WmiPrvSE.exe --- 6140 Services - 0 - 5.716 K