I cannot open my external HD!!!PLEASE HELP!!!...

when i run symantec anti virus it tells me i am infected with Backdoor.Tidserv!inf

Please read here and post a Hijack This log.
http://www.geekpolice.net/virus-spyware-malware-removal-f11/read-this-before-posting-t3821.htm

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Since this issue has been addressed, a "solved" tag will be added and this topic will be closed.

If you need this topic reopened, please contact a staff member. This applies only to the original topic starter.

Everyone else, please open a new topic for your questions.