Can no longer connect to the Internet

sorry make correction
can u restore it to that point before when it was infected

You never mentioned that Avast found a trojan infection, that explains all the problems, it has most likely corrupted several files and you could easily still be infected.

My advise now would be one of two things. You could take a chance that your PC is clean and do a Repair Install or take the "Better to be safe than sorry" route and open a new thread in the Malware forum.Just make sure you read the stickies at the top of the forum and post all the logs they ask for.

Well I wasn't sure if it was infected or not,I had done a Malwarebytes scan which came up 'no infected files',then a tfc which also came up 'no infected files' as my fortnightly cleaning schedule,and then when scheduled boot time scan with Avast ran and completed it was after that when I could no longer connect to the internet on it. Which is why I thought it may have had a virus.

Clearly there is no fault on the USB dongle it is the PC that has the problem.

When you mentioned having to scan again for Trojan/Virus in post 19 I assumed you new what it had found. Some Trojan infections can be very dangerous and can be difficult to detect even with more advanced Malware scanners. A Backdoor Trojan, for example, can send things like passwords for bank accounts back to the person that wrote the Malware. Avast may have a log of quarantined infections so you might be able to see what it found.

Malwarebytes is an excellent scanner but it can miss infections and TFC is only a temporary file cleaner it will not detect anything. The advanced scanners are OTL, DDS and GMER, all used by the experts in the Malware forum. Don't be tempted to look these up and try them out as you need the guidance of an expert or you may do more harm than good.

As you scan once a fortnight I would say it is a fairly safe bet that if you do a System Restore back to before the previous scan (two scans ago) then you should have a clean PC but there is no guarantee. Your other choice is to gamble on the possibility that there is no infection remaining and simply run a Repair Install from the OS disc to fix the damaged files (which you clearly have). Or, you get the PC checked in the Malware forum.

The only other option is to format the whole drive and do a clean install of the operating system.

The problem you had with the DNS Resolver cache was most probably caused by the service being turned off, it is not an essential service.

Thank you Mark for all your guidance.This might sound dumb and probably is but I tried to do a system restore and it couldn't because there are no restore points,and I'm not sure but should I have been creating them? reading your post about bank details etc I've just now gone into network sharing centre and disabled the USB dongle.

What would a repair install do? I guess what I'm asking is will it wipe all programs and files (Music,Videos,Photos etc) off my PC? I'm willing to do whatever it takes to get the internet working on it again but it's just that I use that computer mainly for music production as i am a beatmaker and recording artist and I really don't want to lose all my studio files etc And as you may tell I don't know much about the correct termanology and computer tech side of things etc

But I really appreciate all the help and hanging in there with me

A Repair install will only replace the operating system, leaving all your software intact (and also any Malware).

If you want to protect your files then back them up to another drive.

Personally I would go to the Malware forum and have an expert take a look or back up all your files and do a full format of the drive and reinstall the OS. It's your call.

Jbeezy, I've just seen your new thread in the Malware forum and you have not posted the logs they ask for in the sticky at the top of the forum. They are very busy and therefore centre there attention on the people that follow the rules so you may get overlooked. Go back and read the intro 7 step guide and post the logs. Be sure to add the logs to your first post or it will appear that someone is dealing with your problem and your thread will disappear from the unanswered posts list.

Jebeezy you try this link
http://majorgeeks.com/Advanced_System_Restore_d6339.html

I tried the link to Advanced System Restore,ran it and still no luck with connecting. I'm sensing that Avast removed some important file or something which is not allowing internet access,even all the Winsockfix and other fixes aren't doing anything. Is there something I am missing setting wise?

As you are now receiving help from a Malware expert Broni, who is very well informed, do not make any alterations, run any scans or try any other operations unless directed by Broni, as this could make Broni's job a lot harder and confuse the results of any scans that he requests.

You should ignore any other advise that may be given in this thread until Broni has finished all the checks on you PC.

Hi JBEEZY

I think you're between the rock and a hard place. I just happened to notice your current malware thread with Broni who has tried looking at your problem for malware and suggests you try the Windows OS forum again

In which case i think you're best to backup all your stuff and then bite the bullet. You could try a Windows repair but you might be best and quickest at this point to just do a full Windows 7 reinstall. I'd suggest you backup with something like EASUS Backup which will give you both a disk image clone as well as full folder/file backup.

I think I would have to agree, if Broni can't find any Malware to remove it could well be the damage was already done before Avast removed the threat. Something in the registry has probably been damaged and trying to find it will be like looking for a needle in a haystack.

A clean install of the OS will be the easiest and quickest solution.