Help needed re a virus

[marshy]

I installed avast a few months ago & everything has been fine. However I now have a virus. It was discovered by avast when i switched my pc on. the message is as follows.
 
C/ Windows system32task.dLL.Win32.Lager trojan horse

I followed the instruction & moved the virus to the chest. However, everytime I re-boot the PC the same message comes up & I can't seem to delete the virus. I am concerned that it could spread. The pc works fine, but each time I switch the pc off & re-start, the virus message comes back. What can I do?

[Lisandro]

But each time I switch the pc off & re-start, the virus message comes back. What can I do?

If a virus is replicant (coming and coming again), you should:
1) disable System Restore
2) Clean your temporary files
3) schedule a boot time scanning with avast
4) use a-squared or ewido (trojan removers).

Feel free to ask for further help and welcome to forums 

[marshy]

many thanks for your assistance. Forgive my lack of pc knowledge, but where can I get a "squared or ewido (trojan removers)." from. Are there any free sites on the net.?

[XMAS]

many thanks for your assistance. Forgive my lack of pc knowledge, but where can I get a "squared or ewido (trojan removers)." from. Are there any free sites on the net.?

You can get Ewido Anti-Malware from here: http://www.ewido.net/en/
and a-squared from here: http://www.emsisoft.com/en/software/free/

[Spiritsongs]

   Hi marshy :

     If your Operating System is either Win XP or Win 2000,
     you should use "Ewido"; there is a "tutorial" at :
     www.greyknight17.com/spy/Tutorials/ewidoQuickGuide.pdf