Can you run an antivirus program that isn't dependent on the hard drive this occured with? As an example, Symantec will run from the CD. Either that, or you may have another computer you can put the questionable drive into and run good antivirus software against it.

My thoughts here are that a batch file could have done anything to your computer, but that doesn't mean that it did. If you can run a full file system scan, you can see if you have a problem or not.

The reason to not just run your own antivirus client on the drive that may be infected is that some virii disable AV software, so you get a false negative.

The reason to not just reformat and wipe is that putting in the text string (without quotes) "flash-br" calls up nothing in Google that is related to a virus, nor does entering this in at www.sarc.com. You may still decide to wipe the drive, but that may be akin to killing a fly with a thermonuclear device.