system
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Which version of Windows are you using?
Try and restore the Last Known Good Configuration.
Windows 7 and Vista
http://windows.microsoft.com/en-US/windows-vista/Using-Last-Known-Good-Configuration
XP
http://www.computerhope.com/issues/ch000626.htm
If this works which it should it will get you back to the Desktop
Once you are able to get back to the Desktop.
- Uninstall the Browser that is causing the problem.
- Clean you hard drive using CC Cleaner, Wise Disk Cleaner, Wise Registry Cleaner, Windows Cleanup Manager. There is a lot of overlap with the four but not everything so it is better to scan and clean with all four and not just one.
- Reboot your computer.
- Download Malwarebytes if needed and do a complete scan. Quarantine what it finds but don’t delete.
- Download Mcafee Stinger and do a complete scan. Make sure to set the Preferences to include Boot, Very High, Super Scan and leave the option at Repair.
- Reboot and then do a Windows Image Backup.
- Re-Install Avast if if was not installed on the restored Windows and do a complete scan with Avast. If Avast finds anything try and Quarantine it and not delete it.
- Reinstall the Browser.
- Set Windows to do at least a weekly Backup including the Image files.
Whatever Malwarebytes, avast! or Stinger Quarantines take a snapshot of and post back here.