Completely Get Rid of Win32:BHO-ALX[Trj]

Complaints about Win32:BHO-ALX[Trj]:
Avast automatically blocks it(Win32:BHO-ALX[Trj]). In the virus chest under name is is called IEOptimizer64.dll with the location C:Program Files (x86)\SavingsBull.

After running a full scan another item was added to the chest. Name is 6273be.msi. The original location is C:/Windows/Installer

I noticed another area in which it is in, but not picked up by avast C:\Program Files\SavingsbullFilter. **have tried deleting it, but won't allow me to**

I keep getting popups of it being blocked by avast and having more copies added to the chest.
Another thing is when it is blocked firefox will close out.

How harmful Win32:BHO-ALX[Trj] is?
Win32:BHO-ALX[Trj] is a nasty computer virus which is detected by antivirus software and classified as Trojan horse.  Here are the vicious tasks of Win32:BHO-ALX[Trj] virus:

Win32:BHO-ALX[Trj] will drag down the performance of the infected PC day after day. Usually, Win32:BHO-ALX[Trj] will run in the background to fill up lots of hard disk space with many unwanted items and take up high CPU usage.