Trojan Dialer ,Alt.Net removal?

Altnet is related to Kazaa. You should run:KazaaBegone

After that, please follow ALL the steps in this Sticky thread READ ME FIRST BEFORE ASKING FOR SUPPORT: Basic Spyware, Trojan And Virus Removal
If you already have any of the programs linked in the tutorial please double check your version to make sure you have the latest one and that you have any/all updates for the programs.

NOTE: In order to resolve the issues you are having it is very important that you at least try to perform all the steps as outlined. If you have any difficulty please post back letting us know what steps you have completed, what you found while doing the scans if anything and details about any problems you have encountered in completing the steps. The more details you can provide the better.

After doing ALL of the above if you still have a problem:

Make sure you have HijackThis 1.99 and follow the guidelines on where to install it and how to post a log as an attachment. This is all covered in the sticky thread NO HIJACK THIS LOG FILES BEFORE READING THIS: HJT Tutorial & LOG File Posting

Now post a HijackThis as a .txt file attachment to your message. All running programs should be closed, including your web browser, e-mail. Close before running Hijack This!

To repeat: Do NOT run Hijack This from the Desktop, a temp folder, or a sub-folder of C:\Documents and Settings, or choose to run it directly from the downloaded ZIP file. Place it in its own folder, for example C:\Program Files\HJT

 

And which anti-virus program were you using? Sounds like it should be dumped. You do not need to uninstall what you loaded during the READ ME FIRST. The are all good and valuable programs to keep for the future.

 

Check out this thread: How to Protect yourself from malware!
You should do all of that. But note the three Virus applications mentioned are all free and very good.