All of these facilities have perfectly legitimate uses and indeed may be essential for some sites. The embedding of JavaScript in the underlying HTML code. Examples include Macromedia Flash Player and Java. Plug-ins, which add new capabilities to a browser, such as the ability to play audio or video clips. Cookies, files created by a web site to store information on a user’s computer about use of that site. Pop-up windows, that appear on entry to a site. Sources of vulnerability include the use of: 1. Browsers have a basic vulnerability because they may connect to sites that are “malicious”. In the two-level model, such error handling would be a management level responsibility. Some of these may indicate a problem with Firefox so this mechanism is also useful for error reporting in general. Firefox caters for this possibility by allowing users to report “broken web sites”, as indicated in Figure 1.7. This can occur if the site is developed using features supported only by a particular type of browser, or even a particular version of a browser. One basic problem with a browser is that it may not present pages as intended by the web site designer. Instead, therefore, some form of soft query to management level software is preferable, allowing for a controlled termination of the transaction or perhaps an explanation of the delay. One difficulty, however, is that the user may be involved in an extended transaction at that point, such as paying for a service or product by credit card, so breaking the connection may leave the transaction in an uncertain state. If a browser “hangs” in interacting with a web site it can be cleared with the stop button if it fails to “time out”. For browsers, there is less data involved so saving and restoring a state is more straightforward. Firefox, for example, saves information about the web sites it has open at the time of closure and the session restored to that state when it is re-opened ( Figure 1.6). In particular, the state of a browser can be saved periodically so that recovery is possible in the event of failure. With increasing web site sophistication and complexity, browsers now also share similar problems to other applications and so can benefit from the two- level approach in the ways outlined for Microsoft Word in the preceding sub- section. That is, like Microsoft Word, browsers mix functional and management activities in a single piece of software, rather than separate them out, as proposed in the two-level self-management model. web browser, such as Internet Explorer, Firefox or Opera, is similar in structure to most other applications. I know this would happen sometimes under XP, but I am not fully certain if Vista or 7 had this problem. It would show files/folders from AVG, although AVG service may not be running & AVG components may be missing. Try to restore to a prior date that you had AVG. Then delete the remainder folders from AVG after a reboot. to disappear or reappear upon a restore.Įxample: You install AVG & run it for a few months. You may be correct there, but it has been my experience that System Restore occasionally does cause certain files/folders on Desktop/Program Files/etc. System Restore uses restore points to return your system files and settings to an earlier point in time, without affecting personal files. I was under the impression that it did restore certain files, but left My Documents alone.
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