I was experiencing the same as you this morning.
Below is what I found that worked perfect for me. Once able to open the task manager and closing the sysguard.exe I was able to install Rkill and then install Malwarebytes (both from my usb flash card downloaded from my clean computer). I'm running Malwarebytes on my infected laptop as I type (I'm on my desktop)
Copied and pasted from here: http://www.softsailor.com/how-to/13501-how...oval-guide.html
- posted by Shami - Read comments at the bottom.
Re-start your computer and then as fast as you can right click on the task bar (the bar at the bottom of the screen), this will open a white box with downward headings.
Click on “task Manager” and wait for this to open. Importantly this will keep open the windows task manager box!
On the “windows task manager” you will see a few headings click on “processes”
On the bottom left side of the “processes” make sure the “show processes from all users” is ticked if not tick this box.
Then under the heading “image names” look for the following “sysguard.exe” however, it may have some other letters before it say “edrsysguard” left click this once and it will be highlighted.
Then left click the “End process” and double check there is no others of that name.
Then click the main start button and go in to control panel then click on “internet options” which will open a box with the heading “internet properties” then click on “connections”.
On the bottom right, you will see “LAN settings” click this and it will open a box with the heading “local area network (LAN) setting”.
Now any boxes that have a tick, un-tick them, make sure every box is empty ! And press ok.
This will now stop all the pop up boxes!
Now log onto the internet and get anti malware.
If you cannot get onto the internet, go back to the “local area network LAN setting” and click the box “Automatically detect setting”
Do not turn off or restart your until you loaded and run the anti-malware