Please do not deviate from these instructions and introduce your own attempted fixes.
Please click the Scan now button under Check for updates in the link below:
Please remove Avira.
http://www.techsupportall.com/avira-uninstall-tool/
Please remove Microsoft Security Essentials:
Restart your computer and install Microsoft Security Essentials. Update definitions and run a complete scan:
http://www.microsoft.com/en-gb/download/details.aspx?id=5201
Please allow 2/3 hours for the system to run before uploading further information so that the impact of making changes can become apparent. Restart your computer twice during this time.
Please provide a copy of your System Information file. Type System Information in the Search Box above the start Button and press the ENTER key (alternative is Select Start, All Programs, Accessories, System Tools, System Information). Select File, Export and give the file a name noting where it is located. The system creates a new System Information file each time system information is accessed. You need to allow a minute or two for the file to be fully populated before exporting a copy. Please upload to your Sky Drive, share with everyone and post a link here. Please say if the report has been obtained in safe mode.
Please upload and share with everyone copies of your System and Application logs from your Event Viewer to your Sky Drive and post a link here.
To access the System log select Start, Control Panel, Administrative Tools, Event Viewer, from the list in the left side of the window select Windows Logs and System. Place the cursor on System, select Action from the Menu and Save All Events as (the default evtx file type) and give the file a name. Do the same for the Applications log. Do not provide filtered files.