Plesk - Access Denied To 'cmd.exe'

When logging into Plesk you receive the following errror:

DefPackageMng() constructor failed: defpackagemng failed: Access is denied. (Error code 5) at CreateProcess 'C:\WINDOWS\system32\cmd.exe /c ""C:\Program Files\SWsoft\Plesk\admin\bin\defpackagemng.exe" --get"'
at execUtil C:\Program Files\SWsoft\Plesk\admin\bin\defpackagemng.exe --get on C:\Program Files\SWsoft\Plesk\admin(PleskSrvClient::execUtil line 420)
at execute console command --get(vconsoleapp::start line 128)
at execute "C:\Program Files\SWsoft\Plesk\/admin/bin/defpackagemng" --get(vconsoleapp::run line 138)
---------------------- Debug Info -------------------------------
0: C:\Program Files\SWsoft\Plesk\admin\plib\class.DefPackageMng.php:14 psaerror(string "DefPackageMng() constructor failed: defpackagemng failed: Access is denied. (Error code 5) at CreateProcess 'C:\WINDOWS\system32\cmd.exe /c ""C:\Program Files\SWsoft\Plesk\admin\bin\defpackagemng.exe" --get"'
at execUtil C:\Program Files\SWsoft\Plesk\admin\bin\defpackagemng.exe --get on C:\Program Files\SWsoft\Plesk\admin(PleskSrvClient::execUtil line 420)
at execute console command --get(vconsoleapp::start line 128)
at execute "C:\Program Files\SWsoft\Plesk\/admin/bin/defpackagemng" --get(vconsoleapp::run line 138)")
1: C:\Program Files\SWsoft\Plesk\admin\plib\class.Components.php:171 defpackagemngmaker()
2: C:\Program Files\SWsoft\Plesk\admin\plib\class.Components.php:97 components->getcomponetslist(boolean true)
3: C:\Program Files\SWsoft\Plesk\admin\htdocs\login_up.php3:610 components->componentupdate()

It appears the reason of the problem was in denied rights to C:WINDOWSsystem32cmd.exe file to SYSTEM account. You can give it FULL CONTROLL to SYSTEM account to that file and after that was able to log into Plesk.

Go into the permissions screen for this file and select 'Full Access' for the 'System' User. Once this is done, plesk should work correctly.

But the situation is not clear. We don't know was it done manually or viruses did that. Windows Update could have also caused the above issue as well. You can test your system for viruses using the following utility:

http://download.drweb.com/drweb+cureit/

The above could have possibly been caused by the following virsues:

BackDoor.SHELLBOT
Backdoor.HacDef.100
Backdoor.WinShell.50
Trojan.Aphex.71