virus 2nuk.com

It's a PWS trojan and it comes with other files as well that's why when deleting that one file it gets recreated.
Use MalwareBytes and ComboFix and show us the log file... .

Download Malwarebytes' Anti-Malware to your desktop, check for the tool's Updates before running a scan.
http://www.malwarebytes.org/mbam.php 
 

Or just run Combofix
Please download ComboFix by sUBs:
http://download.bleepingcomputer.com/sUBs/ComboFix.exe 
You must download it to and run it from your Desktop
Now STOP all your monitoring programs (Antivirus/Antispyware, Guards and Shields) as they could easily interfere with ComboFix.
Double click combofix.exe & follow the prompts.
When finished, it will produce a log. Please save that log and attach it in your next reply by pasting it in the "Code Snippet" or "Attach File" window.
Re-enable all the programs that were disabled during the running of ComboFix..

Note:
Do not mouse-click combofix's window while it is running. That may cause it to stall.
CF disconnects your machine from the internet. The connection is automatically restored before CF completes its run. If CF runs into difficulty and terminates prematurely, the connection can be manually restored by restarting your machine.


If needed, here's the Combofix tutorial which includes the installation of the Recovery Console:
http://www.bleepingcomputer.com/combofix/how-to-use-combofix 

It's a password and info stealer, so I would suggest changing all passwords that have been used in the infected system(using another clean pc).

Also scan with Flash_Disinfector.exe and follow the prompts.
http://download.bleepingcomputer.com/sUBs/Flash_Disinfector.exe

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