1.Clear your Cookies
This is EXTREMELY important. Cookies are small files that are sent to your computer by the websites that you visit. They follow what you do on those websites, and in this case, report back to the advertiser's server when you have completed an offer. So if your computer does not allow cookies to function, the advertiser does not know when you have completed the offer. The first thing you should do is check the privacy settings in Internet Explorer. Click Tools, then Internet Options, then the Privacy tab. You should see a slider bar. Drag the slider bar so it displays Accept All Cookies as your privacy setting. Then click the Advanced tab and UNCHECK "Override automatic cookie handling", if it is checked.
You will also want to check and make sure that if you have any virus protection programs such as McAfee, Norton, Symantec, etc, or spyware protection software such as Spy Sweeper, that these programs are not blocking third-party cookies. Check the help files of your particular program to learn how to turn off cookie blocking.
You are using a dial-up accelerator
Using a dial-up accelerator is a big no-no. Most of the time you will not be able to access the site at all. If you can, it will often get in the way of crediting because it alters your IP address such that the advertiser cannot track it. Do not use a dial-up accelerator while using the site.
You have already clicked on the offer several times, either on this site or another, or have completed a large number of related offers in a short time span
The advertisers are trying to prevent fraud by limiting the number of times that a single IP address can get credit for related offers. This is to ensure that people cannot simply use bot programs to fill out surveys for them. It may also be advisable to NOT use a form-filling program such as RoboForm - the speed at which you go through pages is also a factor used in determining whether the survey was filled out by a real person or not.
That's why You should Clear Cookies After Each And Every Survey.And Rotate Your Emails..For Each Offer
Hope This Helps!!