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today i downloaded a file and open it...
i had eset smart security in my windows 7 ultimate and it did n't recognize that file as a virus(latest update of eset)
sometimes eset found some dll files in windows\system 32 as trojans and cleaned them.
i reset my system and after reboot and quick scan with eset, eset showed me the error below :

Operating memory » \GLOBAL??\7571a07c\WINDOWS\$NtUninstallKB54541$\1970380924\Desktop.ini - Win32/Sirefef.DN trojan - cleaned by deleting

also i figure out my windows firewall has been damaged and i have the error below about that :

after the other reset eset did n't work so i tried to reinstall it(uninstall and install again)
but i could n't install it again because of an unknown error.
please help me to remove that trojan and fix the problems.
i searched many many web sites by google, but i could n't find a good solution.
really appreciate for help

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possible duplicate of Computer is infected by a virus or a malware, what do I do now? – Dave M Mar 20 '12 at 1:53
hi dear bro, but i am looking for a solution for a specific trojan -> mean Win32/Sirefef.DT... – LostLord Mar 20 '12 at 2:00
@SilverLight it's no use posting here, this is not an malware forum, post in an malware forum like malwarebyte's one which you mentioned above. – HackToHell Mar 20 '12 at 4:28
ok guys...thanks for attention – LostLord Mar 20 '12 at 7:06
up vote 1 down vote accepted

Just cleaned out sirefef.dt from XP machine. Only one infected file was found. Serial.sys in Windows\System32\drivers.

Easy fix = Start in safe mode - delete serial.sys - replace with known uninfected one - reboot - fixed.

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