I think I have found the problem but I can not remove it. How do I remove Bit Download? I have tried to remove it, run Avast scans and Windows defender. Any ideas?
Dragonfly
If a virus is replicant (coming and coming again), you should:
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Disable System Restore on Windows ME or Windows XP. System Restore cannot be disabled on Windows 9x and it’s not available in Windows 2k. After boot you can enable System Restore again.
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Clean your temporary files. You can use CleanUp or the Windows Advanced Care features for that.
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Schedule a boot time scanning with avast. Start avast! > Right click the skin > Schedule a boot-time scanning. Select for scanning archives. Boot. Other option is scanning in SafeMode (repeatedly press F8 while booting).
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It will be good if you download, install, update and run AVG Antispyware. Some users recommend SUPERantispyware, Spyware Terminator and/or a-squared (take care about false positives).
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Use the immunization of SpywareBlaster or, which is better, the Windows Advanced Care features of spyware/adware cleaning and removal.
I tried this before (a month ago) but I will try again. Question: after I disable system restore, when do I enable it again?
Dragonfly
After step 3 will be good.