Yes you can remove all the old users stuff.
Have "Hijack This" fix all the following items in the list below by placing a check in the appropriate boxes.Confirm that you have only the listed ones checked, then press <Fix checked> and Close
HJT.
O2 - BHO: BDEX System - {62EA9201-8CC7-4199-AC30-7744F836322E} - C:\WINDOWS\ttvbontvm.dll
O21 - SSODL: xcvwer - {E1409E54-4D1C-48B7-A269-0D3ADC40C94E} - C:\WINDOWS\xcvwer.dll
Reboot.....
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This will help to identify malware on your system.
Please download
Combofix from any of these locations:
Here
or
Here
Save ComboFix to the desktop and please ensure that you disable realtime security/virus programs that monitors your PC while CF is running.
1. Double click on combo.exe & follow the prompts.
2. When finished, it will produce a logfile located at C:\ComboFix.txt.
3.
Copy and Paste the contents of that log in your next reply with a new hijackthis log. Do not use Code or html unless asked for.
Note: Do not mouseclick combofix's window while it is running. That may cause your system to stall/hang.
Caution...Never run and remove files using ComboFix without being supervised by a security analyst.