Ok, have you tried to solve the problem on your own? This is truly more than likely a cookie problem, I don't know what browser you are using, but here is a couple tutorials that tell you how to delete your history and cookies.
For Internet Explorer 5 and above, you can follow these directions to clear out temporary files and delete cookies.
1) Open Internet Explorer and click on Tools
2) Click on Internet Options
3) On the General Tab, in the middle of the screen, click on Delete Files
4) You may also want to check the box "Delete all offline content"
5) Click on OK and wait for the hourglass icon to stop after it deletes the temporary internet files
6) You can now click on Delete Cookies and click OK to delete cookies that websites have placed on your hard drive.
To clear the Internet History in IE:
1) Open Internet Explorer and click on Tools
2) Click on Internet Options
3) On the General Tab, in the middle of the screen, click on Clear History
4) Click OK
To clean up other temporary files on your computer in Windows 98 or higher:
1) Click Start, Programs (or All Programs), Accessories, System Tools, Disk Cleanup
2) Choose the correct drive usually C:\
3) Check the boxes in the list and delete the files
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FIREFOX
Step1
Close out windows and tabs. This first step involves getting your browser use under control when you have too many pages open. To close a window, click on the close button at the top right. Closing a window with multiple tabs will close all of the tabs in that window: alternately, you can choose to close only one or more tabs singly.
Step2
Choose one or more "Clear Private Data" options by going to the "Tools" link and down to "Clear Private Data."
Step3
Clear different parts of your data queue by checking or unchecking lines of the resulting window. You can choose to delete one or all of: Browsing history, saved form and search history, Download History, Cache, Cookies, Saved Passwords or Authenticated Sessions.
Step4
Open history in the sidebar and delete individual browsing history links one by one. This is an alternate method to blanket-deleting by choosing "Browsing History" under "Clear Private Data."
Step5
Clear individual downloads. Open the downloads window and click on "Remove" next to a download to delete it from your download list.
Step6
Find relevant folders and delete info at its source. For cookies, find the folder that holds them and delete them singly or in bulk. There are some cookies that are difficult to delete this way, but most of them will simply disappear.