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Explorer.exe should not have caused this. Follow the step outlined below and we shall move on from there.

[*]Step #4 Run ComboFix
Download ComboFix by sUBs from one of the suitable locations listed below and save it to your Desktop.
Download Link #1
Download Link #2
Donwload Link #3

Warning
Please acknowledged yourself this warning beforehand. The tool, ComboFix, is an extremely powerful malware removal tool if not one of the most powerful tools ever created. In the hands of an inept person or a simple mistake can render your machine un-bootable. Peruse every step I listed below unless you want a dreadful occurrence.
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[]Disable your security software. For more information, peruse this thread;
[*]Right-click and choose Run as administrator to run the program.
[*]As a buit-in process, ComboFix will check if you system has Microsoft Windows Recovery Console installed. Let Combofix download and install Microsoft Windows Recovery Console.
[list][*]It requires an active internet connection.
[*]If your system already has Microsoft Windows Recovery Console installed, this step will be skipped
[*]ComboFix will now scan your system for malwares and will attempt to remove them.
[*]Note: ComboFix performs fifty steps during this fix. Please be patient.
[*]After the scan your system will reboot and a log will be produced. The log is automatically saved in C:\ComboFix.txt.
[]Attach the log in your next reply.[/list]

Crucial Notes:
[*]Do not mouse-click when ComboFix is running as it may stall.
[*]Do not re-run ComboFix if you face a problem. Ask for my instruction here.
[*]ComboFix will make Internet Explorer your default browser and will change number of different Internet Explorer settings.
[*]ComboFix prevents autorun functions of all CD and USB devices to assist with malware removal and increase security. If this is an issue or makes it difficult for you, please tell me.
[]It is possible that ComboFix, even on its first run, may have fixed the problems you are having. We strongly suggest that you still post your log into the topic that you are receiving help as you most likely will have infections left over that your helper will need to analyze further.
[]ComboFix will disconnect your system from internet for security measures. The connection is automatically restored after the scan but if it does not, it can be restored by rebooting the PC.