R1 loon, if you're getting spurious pop ups on your PC (it IS a PC, not a Mac, right?), that may well be indicative of your PC having been infected with, or by Spyware or similar malware. You'll want to get rid of the buggers pretty quick before they possibly turn your PC into a Spambot Factory / Node.
Also, what is the status of your Anti-Virus software? You'll need to ensure that it's up to date. I'm assuming that you are using Windows XP.
Please "Google" and consequently download and install "Spybot Search and Destroy Version 1.6.2". Once it is installed, update the signatures via the internet, then run the immunization procedure, and after that, have it scan your PC. This may take a while, but it needs to be done. Spybot S & D will likely detect whatever malware's infected your PC and give you the option to eradicate it by clicking a fix it button.
If your Anti-Virus software's out of date, may I personally recommend "Avira Antivir", available from "www.avira.de". Install the Classic version, it's absolutely free and has regular updates via the net. Ignore invitations to purchase the premium version, these pop up on a splash screen everytime the software updates itself via the internet.
Hopefully the above suggested software (freeware) solutions will solve the incidence of any spurious pop ups you might be having.
The 21st century is a con. Where's my Hoverbike, 3 day working week & Holiday on the Moon?