The Internet Explorer Cache
The most likely cause of this error is your browser, and the temporary Internet files that are stored on your PC. Also known as the "cache", the temporary Internet files folder is a repository of the websites you have visited, featuring local versions of the pages, images featured in the pages, perhaps media clips that you have viewed and scripts that the page you visited might have used. In addition, cookies are saved on your PC by default when using Internet Explorer; they are required for pages such as Google Calendar where information about you is stored locally to allow a quick sign in to your Google account.
Problems with the cache can cause Google Calendar errors - the "operation aborted" error might be caused by the page attempting to open after your session has ended.
You can force your browser to check with the Google Calendar website for new information by using the SHIFT+F5 keyboard combination. This is effectively a refresh, but forces the browser to check for every file and image that forms the web page you are visiting.
Should this not work, open Internet Explorer, go to Tools > Internet Options > General > Delete and via the dialogue box Delete the Temporary Internet Files and Cookies. Click OK to return to the browser and try again to access Google Calendar; this time you should be successful!
If these steps fail to resolve the issue, however, then you should consider an alternative browser such as Firefox or Opera, or even Google Chrome.