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I have recently been attacked badly by a virus. Unfortunately I did not had an AntiVirus at that moment(I understand that it was a very practice by me.) Now after reinstalling Windows I have tried to install Avast but whenever I install Avast It shows up a blue screen prompting the error message of memory dump and restarts. I have tried to install it in Safe Mode too but the problem remains the same. I would be very thankful if someone could give me a good idea how to deal with such a condition. Thanks.

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Did you reformat the partition/hard drive before reinstalling Windows? If not it could be that the virus isn't completely removed. – ChrisF Jan 25 '12 at 16:47
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I agree with ChrisF, you could see if it is a root kit or boot kit that is still hooked. TDSSKiller which is linked above will detect both. Run it on this machine. – opsin Jan 25 '12 at 16:56
What's the blue screen Stop error code? – techie007 Jan 25 '12 at 16:57
@ChrisF: No, as all my important data was there so I could not format it. – Ak1to Jan 27 '12 at 10:21
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@Akito - We cannot help you fix the problem that causes the computer to restart without it. – Ramhound Jan 27 '12 at 12:54
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Your best bet would be to take the drive out of the machine, put it into an external caddy then use a second machine to create a backup of your data before reformatting the drive.

Actually you don't need a second machine. Buy a new drive for your machine. Swap the out the old drive and install Windows on the new one. Put the old drive in a caddy and use that as an external hard drive/backup drive for your data.

It won't reinfect your new drive as it's not a boot drive. You can also delete the remains of the Windows folder and Program Files folder just to be sure.

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Thanks. I actually have two drives but did not think of it. – Ak1to Jan 27 '12 at 11:23
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Avast is almost helpless when you have already got serious virus.

Leading anti-virus vendors have special solutions in live-cd or simple .exe format to cure system without anti-virus software installation.

For example, Kaspersky Rescue Disc

or CureIT from Dr.Web - no installation needed, just one file.

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Thanks. I tried it but when I ran it, it gave me the same problem as by Avast. – Ak1to Jan 27 '12 at 10:23
While I agree Avast is one of the least effective programs on the market, to be fair to Avast, at this stage of an infection nearly ALL security problems would have a problem. One exception AT THIS TIME would be Malwarebytes because of a new feature that prevent the blocking of their process. – Ramhound Jan 27 '12 at 12:53

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