Help with system32 file

[KampingKarl]

Hello I'm new here and just today i got a virus and avast pop'd up and was all like warning a virus has been detected and the file name is

C:\WINDOWS\system32\crtdl.dll\[UPX]

its a trojan horse and it wont let me delete move or rename so plz help me out

[Lisandro]

I suggest:

1. Disable System Restore and reenable it after step 3.
2. Clean your temporary files.
3. Schedule a boot time scanning with avast with archive scanning turned on.
4. Use AVG Antispyware; SUPERantispyware and/or Spyware Terminator to scan for spywares and trojans. If any infection is detected, better and safer is send the file to Quarantine than to simple delete than.
5. Test your machine with anti-rootkit applications. I suggest AVG or Trend Micro RootkitBuster.
6. Make a HijackThis log to post here or, better, submit the RunScanner log to to on-line analysis.
7. Immunize your system with SpywareBlaster or Windows Advanced Care.
8. Check if you have insecure applications with Secunia Software Inspector.

Happy New Year.