1) Create a Restore Point using System Restore
2) Create a Repair disc (Recovery Drive in Win8.1):
- Go to Start...All Programs...Maintenance...Create a System Repair Disc
- Press "WIN" and "R" to open the Run dialog...type "RECDISC" (without the quotes) and press ENTER
- Go to the Start Screen and type in "recoverydrive" (one word, without the quotes). That will start the recovery drive process. You will need a USB drive of at least 512 mB - and all data will be erased off of it. If copying the recovery partition the drive size will be much, much larger (16 - 32 gB drive required).
3) Test the System Repair disc/Recovery Drive to make sure that you can get to the System Restore entry when you boot from the disk/drive (you may also want to try actually using System Restore to make sure that it works)
4) Download this free program (Autoruns for Windows
) and use it to disable any instances of regi.sys that are starting (or any other Intervideo entries) (DO NOT DELETE - only disable by removing the checkmark in the left hand column)
5) Check in Device Manager (to include showing hidden devices from the View menu item) and ensure that any instances of regi.sys (or any other Intervideo entries) are "Uninstalled" (DO NOT DISABLE THESE).
6) Check in the Services applet (services.msc) to be sure any instances of regi.sys or any other Intervideo entries are disabled.
7) Go to C:\Windows\System32\drivers and rename the regi.sys driver to regi.BAD
(search the hard drive for it if it's not in C:\Windows\System32\drivers).
In the event that the system doesn't boot:
1) Boot from the System Repair disc/Recovery Drive and use the Command Prompt option to rename regi.BAD to regi.sys
ren C:\Windows\System32\drivers\regi.BAD C:\Windows\System32\drivers\regi.sys
2) Boot from the System Repair disc/Recovery Drive and use the System Restore option to restore the system to a point before the changes were made.