|stardusty, I just cleaned out a rootkit from a client's PC, the prob was exactly like yours.|
1- go to start/run/msconfig
2- disable ALL startup items
3- reboot your PC.
That should stop most of the pop-ups.
If you can get on-line:
1- download Ccleaner Slim (no toolbar) and clean the PC, then click on the registry button and clean out all the registry problems....it is safe.
2- run Malwarebytes and remove all it finds
3- download Avast free and allow it to do a bootscan. Move all it finds to the chest , BUT, if the entries are in the windows files, be sure to google the results on another PC to see if they are safe to delete.
If that doesn't clear up your problem, try unhackme, it is free for 30 days, if you are unsure on how to run it, click on the beginners link on the left of the download page and follow the instructions.
That should cure your problem.
I repair PC's on a regular basis daily.
Some HELP in posting on Computing.net plus free progs and instructions Cheers