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if you are running windows go to windows update download windows security essentials this gives you a fully functional and free anti-virus.but if you still want avast check to make sure windows defender is disabled.this is windows own anti virus.also you may have to disable your firewall until avast has installed.for a registry cleaner search for one there are lots of free ones advanced systemcare is a good one.hope this helps
Here is a good way.
1. Install Avast Antivirus from here. CLICK HERE
2. Run Avast antivirus and update it to latest version and definition.
3. On the Avast antivirus window click on SCAN COMPUTER on the left.
4. Click on Boot-time Scan right below SCAN COMPUTER.
5. Set Boot-time scan parameter to All harddisk
6. Click on Schedule Now
7. Save all your work or whatever you are doing before restarting
8. Click on Restart computer.
so when you boot your computer Avast Anti-virus will run before windows so it is a good way to delete viruses.
Hope it will solve your problem
Use AVAST free online scanner. Start the system in safe mode (hit F8 continuously as the system powers up, choose safe mode with networking)
When in safe mode go to
and scan. After the scan download their free AV program.
I think isn't possible from there...I personally recommend to use an anti-virus software... The best for doing that is (Avast) the free version works perfect... i recommend it because Avast give you the option to make a boot time scan that scan your computer before windows start the processes where the must virus load and make it very difficult to remove... you can download it from (here) once you have downloaded it > first: make sure that there is no other anti-virus installed, if one, remove it... Second: Install Avast... when the installation are almost finish it will ask you if you want to make a "boot time scan" click "yes", finish and restart your computer...When the laptop boot up you will see first the windows logo and then a blue screen...Avast will start to scan your hard drive...if any virus are found in your system it will ask you what to do... I normally use the second option "delete all" but you can do some other options. Hope it works for you!
suggest downloading avast anti virus home addition from the avast website here , the home adition is free and auto updates, free to register too. after you have installed and done a pc scan with avast anti virus, may i suggest that you type in the specific DLL file you want from the google search engine. many sites sould have one for you to download. please get the anti virus first as your pc can get infected as soon as you turn one on. 'ad aware', ccleaner are two other programs i personally use and wouldnt be without either. good luck :)