Can't install avast anti virus on my laptop, error self exstract

Windows could not start avast! Anti virus service on local computer.
Error 1075: the dependency service does not exist or has been marked for deletion.
Please help me

Can you post your full model number and operating system.
A general answer is to only have one anti virus installed, Toshiba normally has a preinstalled antivirus program and it needs to be removed before installing avast anti virus.
Avast can give you problems even BSOD if windows defender is turned on so go to control panel then windows defender, under administrative - uncheck the use this program to turn off windows defender. 
Then if you are using Avast internet security you also need to turn off windows firewall so you are not running 2 firewalls.
S70-ABT2N22 Windows 7 Pro & 8.1Pro, C55-A5180 Windows 8.1****Click on White “Kudos” STAR to say thanks!****

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    There are two issues here, the first being your password. If you can't remember your password and really do need to reset it, you will need your MacOS disk. If you have lost this, it would be wise to get a replacement - you can get these from Apple. Since there are other occasions you might need the original install disk, it's not just for an occasional password reset that you would do well to have one on hand.
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    If you don't have an uninstaller:
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  • With the recent amount of publicity of macs being targeted with viruses, it recommended to install an anti-virus program such as kaspersky

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    Message was edited by: Dave Sawyer

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    You do not need any software installed for protection from virus.
    Install all System, Applications and Security updates released by Apple.
    For more on this:
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