Note; If you have an IFEO blacklist, these tools are/will more then likely be blocked. If that is the case. Rename OTL (Which is the main log we need) to [Random Name].SCR
That extension is extremely important. Only do that if needed. I do not recommend it unless absolutely needed. If these tools are flagged for any reason. Be assured they are safe to use. If these programs are blocked by the Group Policy, download a fresh copy and rename them.
Note: Just to be clear. Only OTL is to be renamed. I have not tested any other programs. I have alerted an expert of your case in case they have other plans. If they do, ignore anything thing in this post.
That might be your issue. Is Avast! still not working?
Please download Unchecky and save it to your desktop. Please install the program to help uncheck the boxes for further programs that will/might be downloaded to prevent adware from slowing your system down. (Not our tools, but stuff like Java or CCleaner or Adobe Products)
[*]Then click the Run Fix button at the top
[*]Let the program run unhindered, reboot the PC when it is done
[*]Open OTL again and click the Quick Scan button. Post the log it produces in your next reply.
THEN
Please download AdwCleaner by Xplode onto your desktop.
[*]Close all open programs and internet browsers.
[*]Double click on AdwCleaner.exe to run the tool.
[*]Click on Scan.
[*]After the scan is complete click on “Clean”
[*]Confirm each time with Ok.
[*]Your computer will be rebooted automatically. A text file will open after the restart.
[*]Please post the content of that logfile with your next answer.
[*]You can find the logfile at C:\AdwCleaner[S1].txt as well.
OK a slightly stronger tool, after this has completed could you then run a repair of Avast
Download and Install Combofix
Download ComboFix from one of the following locations: Link 1 Link 2
VERY IMPORTANT !!! Save ComboFix.exe to your Desktop
IMPORTANT - Disable your AntiVirus and AntiSpyware applications, usually via a right click on the System Tray icon. They may otherwise interfere with our tools. If you have difficulty properly disabling your protective programs, refer to this link here
[*]Double click on ComboFix.exe & follow the prompts.
[*]Accept the disclaimer and allow to update if it asks
Download Windows All In One Repair from Here to your desktop
Install the programme and run. Windows and Avast may try to block the programme but allow it to run as it is safe.