I see that you say that there are no .dll files again in System 32/regsvr32
regsvr32 is a program not a folder, so you are not going to find dll files in System 32/regsvr32
Are you sure you followed Mikes instructions in Response #3.
You must have the shimgvw.dll in the folder WINDOWS/SYSTEM32 folder, then you can follow the instructions to run regsvr32.exe
Before wiping your hard drive have you:
a. tried uninstalling your HP printer and/or
b. used System Restore to restore your PC to its state before the printer was installed.
System Restore should bring you back to where you were before the printer was installed.