I can' open my F: (flash drive) with double click

When i open my flash with right click → Explore i find out two strange files named: autorun.inf and Setup.pif.
Avast have cleaned this virus from my computer before. I don’t understand why now, when i scan my computer and my flash, avast dosen’t detect any thing. When i delete manually this 2 files they popup again after 10 seconds. I have updated my avast 1 week ago. Can somebody halp me please… I don’t want to format my computer.
If this can halp i write the text of autorun.inf
[autorun]
shellexecute=setup.pif

A goggle search turned this up

http://www.sophos.com/virusinfo/analyses/trojdownldaap.html

On the advanced tab is a discription much like you are describing. They list a few files and folders that are associated with this. check your system for these files. Perhaps an on line scan might be in order.

Do the scan and post the results in this thread.

[quote author=oldman link=topic=30032.msg247581#msg247581 date=1187592425]

A goggle search turned this up

http://www.sophos.com/virusinfo/analyses/trojdownldaap.html

On the advanced tab is a discription much like you are describing. They list a few files and folders that are associated with this. check your system for these files. Perhaps an on line scan might be in order.

Do the scan and post the results in this thread.

Thank you, i will try. In my home i don’t have internet connection so i cant do a online scan! If i delete this files that are listening in “advanced” and delete that register key, you think that i can remove manually that virus?