This problem occurs because the device containing your operating system is not being detected at boot. This could occur if you have a USB drive plugged in, because some systems try to boot off external media before the main internal drive. Unplug any external drives and take out any media, such as CDs or DVDs. If the message still appears, open your systemBIOS and confirm that your main hard drive (usually C:) is detected. If it is not, the hard drive may need replacement.
If all other websites are working fine, this is most likely an issue related to the website itself. You can confirm by going to the website "Down For Everyone Or Just Me?" and typing in the URL. If it turns out that it is just you, the problem may be related to your PC's security software. Check the software's permissions to make sure that the site you're trying to visit hasn't somehow been added to the list of blocked sites. There isn't a specific set of instructions to address this issue, it depends on the antivirus software or internet connection filter you have installed
Right-click the program you are attempting to use and open its Properties, then click on the Compatibility tab. Check the "Run this program in compatibility mode for:" box and then select the operating system that the program desires. Check the settings boxes below as needed. If the program still does not work, and you are using Windows 7 Professional or Windows 7 Ultimate, you can try running the software in XP Mode. This fully emulates the Windows XP operating system.
Open Windows Activation through a Windows Search and try re-entering your product key. If you are on Windows XP, you'll need to use the Activate Windows utility found in System Tools. Once open, indicate that you'd like to activate over the Internet and enter your product key. If the key is correct (and you're connected to the Internet, of course) Microsoft should verify the key automatically. If the key comes back as invalid, indicate that you'd like to activate over the phone. You'll be given instructions on how to contact a Microsoft representative who can activate Windows for you. In most cases this is a rather a simple process. Remember, a basic retail copy of Windows gives you license to install the OS on one PC at atime. If you call Microsoft to activate a second PC with the same product key, the original PC will have its authentication revoked.
Open the Windows ClearType Tuner. On Windows 7 and Vista machines this can be accomplished by doing a Windows Search for ClearType, while XP users should visit Microsoft's website. If ClearType is not already turned on, check the "Turn on ClearType" box. Once you've done that, proceed through the on-screen ClearType tuner instructions. This will calibrate your system's text based on a series of examples, similar to the way an eye doctor determines your prescription.
Open Internet Explorer by typing iexpore -extoff into the XP Run window or into Windows Search. This will open Internet Explorer without add-ons enabled. If this works, it indicates an add-on is causing the problem. Open the Control Panel, click on Internet Options, and then the Programs tab. Find the Manage Add-Ons button and disable or remove any add-ons that might be causing trouble. If Internet Explorer still does not work, open Internet Options and go to the Advanced tab. Click on the Reset button in order to reset all of Internet Explorer's settings back to their default state. Should this also fail, you will need to reinstall Internet Explorer.
Go to the Control Panel and then open Windows Update. After that, click Change Settings. Most Windows PCs will be set to install updates automatically by default. You canchange this "Download updates but let me choose whether to install them." This will stop automatic updates. However, doing this can leave your computer vulnerable to security threats if you don't remember to install the updates. A better idea is to change the Install New Updates time so that the updates occur when you're not likely to be using the computer. If the computer is not on when the set time passes, the updates will be installed on your next reboot.
This happens because hidden files and folders are still enabled on your PC. Although most people turn this feature off at some point, PCs almost always ship with hidden files and folders on. Open Control Panel and then Folder Options, then click on the View tab and find the two radio buttons under Hidden Files and Folders. Select the one that says "Show hidden files, folders and drives." If the mystery file is where it's supposed to be, it should now be revealed.