This is a problem with gmail. Do you have the kiwee toolbar on your computer? Thats malware. Here is an answer I found on yahoo. Someone said it worked for them so you try it. After some research it appeared to be a trojan (and thus being a fake NVidia driver). Luckily, the solution to this problem is very simple:
-Download and install Malwarebytes' Anti-Malware. (Make sure to tick the "Check for updates" button!)
-Start a Quick Scan
-Remove the infected files (if not all infected files are deleted after first search, perform another Quick Search. I had to perform 2 searches before everything was removed)
You'll get a log file with detailed information; somewhere below you can find
"C:\Users\Your Username\AppData\Roaming\nvdisp.exe (Trojan.Banker) -> Quarantined and deleted successfully.
Thanks if I helped.