Imptestrm.com adware is what is known as a Browser Hijacker.
This piece of software will force ads on your browser, and ruin your browsing experience. You did not install Imptestrm.com and you want to get rid of it, then this guide is for you. Lets get busy removing Imptestrm.com, shall we.
Remove Imptestrm.com from your computer, by uninstalling unknown programs. First thing that I would like you to do is, remove any recently installed programs you do not remember installing, from your add remove programs.
Hit the start button at the bottom left hand corner of your screen. Type or copy and paste appwiz.cpl into the Run/Start/Search Box. Hit enter.
Right click one at a time and select remove.
Remove stubborn Imptestrm.com related programs with Revo Uninstaller free.
If you do not know the program or it seems suspicious, then it may be related to Imptestrm.com Adware.
Remove Imptestrm.com from your computer with Junkware Removal Tool.
Junkware Removal Tool will remove Imptestrm.com adware from your machine, with a few simple clicks.
Download Junkware-RemovalTool Save it to your desktop. Right Click the 
To begin the scan Click any button. Allow the scan to complete, it may take up ten minutes to complete.
Once complete a log will appear on your desktop, detailing what was removed.
Remove Imptestrm.com from Google Chrome, Firefox, & Internet Explorer with Adware Removal Tool.
Download Adware removal tool to your desktop, right click the icon and select Run as Administrator.
Hit Ok.
Hit next make sure to leave all items checked, for removal.
The Program will close all open programs to complete the removal, so save any work and hit OK. Then hit OK after the removal process is complete, then OK again to finish up.
Remove Imptestrm.com malicious files from your browsers, with Adware Cleaner.
Download Adware-Cleaner Save it to your desktop. Right Click the icon, select Run as Administrator.
To begin Click the Scan button.
Adware Cleaner needs to reboot your machine, to complete the removal process. This is normal, allow the program to reboot your machine.
Remove Imptestrm.com with Reason Core Security
Install the program and run a Full Scan, then remove any infections found, this is a free program as well. It will run alongside your current antivirus with no issues.
Remove Imptestrm.com virus leftovers, with Eset Online Scanner
Now lets move onto the ESET online Scanner. Temporarily disable your Anti Virus If you are unsure how to do so, Follow this guide.Click Here to download the scanner, save it to your desktop.
Right Click this image, on your desktop. 
Make sure all the settings are the same as the picture below.
This scan can take a long time, be patient it is normal.
Make sure to tick uninstall application on close, also delete quarantined files.
Finally if this step is needed, then please reset your browsers to default to remove Imptestrm.com .
At this point you may need to reset your browsers to default settings, to make sure all traces of Imptestrm.com are completely gone.
Instructions to remove Imptestrm.com from browsers below:
To Prevent this type of infection happening again.
I suggest you download and install unchecky. This software will prevent unwanted software, from being hidden in legit installs. Sometimes we forget to uncheck useless software when installing wanted programs.
Your computer should now be free, of the Imptestrm.com adware infection.
If you have any questions about this tutorial, or your machine is still infected with Imptestrm.com and you would like help, please feel free to Sign up and post in our Virus, Spyware and Malware Removal Help forum