If there is a pop-up saying that you need to run the program jucheck.exe and the publisher is unknown, then you most likely have a virus. do not let the program run. in that pop-up, click on more details to see the filepath. if it’s not a Java folder, then you DO have a virus.

Shut down your computer and restart in safe mode. Sometimes the popup won’t go away and it doesn’t allow you to shutdown by pressing the start button. to shut down the computer manually, hold down the power button for 10 seconds. Then turn it back on and keep tapping F8. this will bring up a black and white screen. then select Safe Mode using the arrows on the keyboard and press enter.

click on start, then computer, then C. then in the top right corner type jucheck.exe in the search. press enter. you should see some files. you need to look at when the files were created and write it down. If the Jucheck.exe file is not in a Java folder then you should delete it. right click on it, hold down shift, then click delete. click ok. before you delete it, write down the exact time that the file was created.
go back up to the search and type in tmp. it will find plenty of files. find the tmp file that was created the exact time that the jucheck.exe file was created. it should be many numbers and letters in the filename. delete this file the same way.

then restart the computer in regular mode and you are all set.

if you actually allowed the program to run, then I can’t help you. Don’t do any personal banking on your computer until you get it fixed because this program tracks what you do on your computer, then sends the information to the creator of the program.

good luck.