Hi Avinash,

You can easily remove a program by following the below steps in Windows 8:

Right-click the app’s tile from the Start screen; when the App bar rises from the Start screen’s bottom edge, click the Uninstall icon, shown in the margin.

To remove an unwanted desktop program or change its settings, head for the desktop’s Control Panel by following these steps:

1. Right-click in the screen’s bottom-left corner and choose the Control Panel from the pop-up menu.
2. When the Control Panel appears, choose Uninstall a Program from the Programs category.The Uninstall or Change a Program window appears, listing your currently installed programs, their publisher, size, installation date, and version number.
   To free up disk space, click the Installed On or Size column header to find old or large programs. Then uninstall those forgotten programs you never or rarely use.
3. Click the unloved program and then click its Uninstall, Change, or Repair button.
   The menu bar above the programs’ names always displays an Uninstall button, but when you click certain programs, you may also see buttons for Change and Repair. Here’s the rundown:
   
   • Uninstall: This completely removes the program from your PC. (Some programs list this button as Uninstall/Change.)
   • Change: This lets you change some of the program’s features or remove parts of it.
   • Repair: A handy choice for damaged programs, this tells the program to inspect itself and replace damaged files with new ones. You may need to have the program’s original CD or DVD handy, though, because you’ll need to insert it into your computer.
4. When Windows asks whether you’re sure, click Yes. Depending on which button you’ve clicked, Windows 8 either boots the program off your PC or summons the program’s own installation program to make the changes or repair itself.

If that doesn't solve your problem, then follow the below solution:

You can use Avast's uninstallation utility avastclear.

1. Download avastclear.exe on your desktop.
2. Start Windows in Safe Mode.
3. Open (execute) the uninstall utility.
4. If you installed Avast in a different folder than the default, browse for it. (Note: Be careful! The content of any folder you choose will be deleted!).
5. Click REMOVE.
6. Restart your computer.

I hope this helps.

Regards,
Lokesh

Hi Avinash, Here's some info on the aswfsblk.sys process: http://www.reviversoft.com/processes/aswfsblk.sys As explained in the article, it's the avast! File System Access Blocking Driver that AVAST makes use of when it's running. It is possible that this driver was not stopped/disabled/uninstalled correctly, which is why it is causing problems. I would follow Mark's suggestion to restart your computer, reinstall AVAST, exit the AVAST app completely and uninstall AVAST and all its dependencies through the Windows control panel and restart again. You should now be able to install another anti-virus software. Let us know how you go with this. James

Hi Avinash, Sounds counter intuitive but I would recommend that you reinstall Avast and then try to uninstall it again by using the Control Panel. Here\'s how: http://www.reviversoft.com/blog/2013/04/how-to-uninstall-a-desktop-app-in-windows-8/ Sometimes problems can happen during an uninstall and fragments of applications can be left over. Reinstalling and then going through the uninstall process again can resolve this.