Hi Isabelle, welcome to daniweb. Let's begin with that laptop first ok, see if we can get it cleaned up and THEN go onto the desktop. It would be too confusing for both of us to try to work on both at the same time. First of all, you have answered one of your own questions;
I don't know how i got it as i didnt download anything but i did open a torrent file.
That is more than likely how you got it.
What operating system do you have on the laptop? XP....Vista?
I would like you to try to do this ;
Please download Malwarebytes' Anti-Malware (MBA-M) to your Desktop.
* DoubleClick mbam-setup.exe and follow the prompts to install MBA-M.
* Be sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
* If an update is found, it will download and install the latest version.
* Once the program has loaded, select Perform full scan, then click Scan.
* When the scan is complete, click OK, then Show Results to view the results.
* Be sure that everything is checked, and click Remove Selected.
* When MBA-M finishes, Notepad will open with the log. Please save it where you can find it easily. The log can also be opened by going to Start > All Programs > Malwarebytes' Anti-Malware > Logs > log-date.txt.
...I fear that your going to tell me something about using safe mode and.... i'm gonna be so clueless....
Just take a breath, be calm. Very easy to do, really. Here are instructions for both XP and Vista since I don't know your operating system.Windows XP
Using the F8 Method
1. Restart your computer.
2. When the machine first starts again it will generally list some equipment that is installed in your machine, amount of memory, hard drives installed etc. At this point you should gently tap the F8 key repeatedly until you are presented with a Windows XP Advanced Options menu.
3. Select the option for Safe Mode with Networking using the arrow keys.
4. Then press enter on your keyboard to boot into Safe Mode with Networking.
Windows Vista
Using the F8 Method
1.Restart your computer.
2.When the computer starts you will see your computer's hardware being listed. When you see this information start to gently tap the F8 key repeatedly until you are presented with the Windows Vista Advanced Boot Options.
3. Select the Safe Mode with Networking option using the arrow keys.
4.Then press the enter key on your keyboard to boot into Vista Safe Mode with Networking.
5. When Windows starts you will be at a typical logon screen. Logon to your computer and Vista will enter Safe mode.
Now I ask for Safe Mode with networking because this way, when in just Safe Mode this loads the computer with the barest essentials necessary to run and without the modem files. Safe Mode with Networking will also allow the modem files to start too and therefore you should be able to also get online and download the necessary programs. Let me know if this is possible for you. If you can do this then download Malwarebytes' and install, update and then run the scan and let it fix whatever it finds while it is STILL in safe mode.
It may say something will be deleted on reboot. If so just shut down and reboot the computer as you normally do...this time it will boot into normal mode and remove the bad files while it boots up.
Post back here with the log.
Judy
P.S. also while in Safe Mode with Networking download HiJackThis Just save it to the desktop or My Documents. Don't run it yet.
Once you have done the Malwarebytes' and rebooted to normal mode then run a full system scan with HiJackThis and save the log and post it back here with the Malwarebytes' log.