Some clues would be nice - like the filenames? Duh! sorry.
Please downloadand install Malwarebytes Anti-malware(free version) from http://www.malwarebytes.org/products/malwarebytes_free/- UNtick 'Enable free trial of MBAM PRO' at the end of the installation - and update it, then run a full scan in your main account, and Quick scans in anyother user accounts.
Delete everythingit finds
My Computer
Computer type
Laptop
Computer Manufacturer/Model Number
Asus K52F or Lenovo B51-80
OS
Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
CPU
i3 370M/i7 6500U
Motherboard
Asus/Lenovo
Memory
8GB - finally :)/8GB
Graphics Card(s)
it's an i3, dude!/dual Intel&nVidia
Sound Card
onboard
Monitor(s) Displays
15.6" built-in
Screen Resolution
1366x768/1920x1080
Hard Drives
750GB Seagate internal
Sundry external drives attached to other computers on the local network
1TB SSD on the Lenovo
PSU
n/a
Internet Speed
as much as I can get - usually on a dongle/phone, so <1MB/s
I have added Microsoft Security Essentials to the System Spec.
I'm running Malwarebytes Anti-Malware as we speak. Been running for 3 hours now...
I ran Spybot - Search & Destroy and it couldn't find anything
I run MSE every night and it has not found anything
To my second question: Should there be any programs (*.exe) in the directory %appdata%\Microsoft\Windows or can I add a Local Security Policy disallowing programs to start from this directory?
My Computer
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Dell Vostro 1720, HP 7300 elite mt
OS
Microsoft Windows 7 Ultimate 32-bit 7601 Multiprocessor Free Service Pack 1
CPU
Intel(R) Core(TM)2 Duo CPU P8700 @ 2.53GHz, 2 cores
Motherboard
Dell Inc. 0J056T
Memory
4GB
Graphics Card(s)
NVIDIA GeForce 9600M GS, 512 Mb
Sound Card
High Definition Audio Device
Screen Resolution
1440 x 900 x 59 hertz
Hard Drives
ST750LX003-1AC154 ATA Device 698,64 GB
Keyboard
Standard Keyboard - PS/2
Mouse
Microsoft Wireless Notebook Presenter Mouse 8000 (IntelliPoi