I doubt it has anything to do with these forums
. If the problem was here, it would get widely reported immediately, and would probably be communicated to everyone, and fixed very quickly.
(I am experiencing no problems here.)
Your computer probably has some sort of malware infection which is giving you malicious pop-ups, twoard the goal of getting you to either spend money
on a sham virus detector / malware removal
program, or install additional malicious software
You should probably make sure your OS and anti-malware software is completely up to date, and do a compete scan.
If you are using windows, AVG is a very good, free malware / virus scanner:
AVG Free - Download Free Antivirus and Antispyware for Windows XP and Vista