There are several manual things you need to uninstall driver 2/3
You can do it manually on the machine or.
1. Remove the activdrvservice service from services
2. Remove the contents of C:\program files\activ software\activdriver\
3. Remove the key
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run \Activcontrol
and
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run \Activfilter
4. Remove Activdrv.sys and Activdrv_usb.sys from
c:\windows\system32\drivers.
I think you will have to do the above without the board attached and do a reboot to get rid of the service.
Thats the driver, Im not sure about the installshield stuff as that gets everywhere.