My brother decided to use my laptop to look at porn, unfortunately for me, I think he opened a codec file with a virus in it. My computer started changing all my display settings/won't let me restore/is going slowly and new icons keep showing up on my desktop. I've tried running Norton and the scans don't show anything. Any idea how to get rid of this?

Please download Malwarebytes' Anti-Malware from one of these sites: MalwareBytes1 MalwareBytes2 Rename the setup file, mbam-setup.exe, before you download it. To do that once the "enter name of file to save to" box appears as the download begins in the filename box rename mbam-setup.exe to tool.exe> click save. 1. Double Click tool.exe to install the application. 2. Make sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish. 3. If an update is found, it will download and install the latest version. 4. Once the program has loaded, select "Perform Quick Scan", then click Scan. The scan may take some time to finish,so please be patient. 5. When the scan is complete, click OK, then Show Results to view the results. 6. Make sure that everything found is checked, and click Remove Selected. 7. When disinfection is completed, a log will open in Notepad and you may be prompted to Restart. If MBAM encounters a file that is difficult to remove,you will be presented with 1 of 2 prompts,click OK to either and let MBAM proceed with the disinfection process,if asked to restart the computer,please do so immediately. 8. The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM. 9. Copy&Paste the entire report in your next reply. If Malwarebytes installed but will not run navigate to this folder: C:\Programs Files\Malwarebytes' AntiMalware Rename all the .exe files in the MAlwarebytes' Anti-Malware folder and try to run it again. Please download and install the latest version of HijackThis v2.0.2: Download the "HijackThis" Installer from this link: Hijack This Rename the setup file, HJTInstall.exe, before you download it. To do that once the "enter name of file to save to" box appears as the download begins in the filename box rename HJTInstall.exe to tools.exe> click save. 1. Save " tools.exe" to your desktop. 2. Double click on tools.exe to run the program. 3. By default it will install to C:\Program Files\Trend Micro\HijackThis. 4. Accept the license agreement by clicking the "I Accept" button. 5.Click on the "Do a system scan and save a log file" button. It will scan and then ask you to save the log. 6. Click "Save log" to save the log file and then the log will open in Notepad. 7. Click on "Edit > Select All" then click on "Edit > Copy" to copy the entire contents of the log. 8. Paste the log in your next reply. 9. Do NOT have HijackThis fix anything yet! Most of what it finds will be harmless or even required.