This error may appear when you try to log on to Microsoft Exchange Server with Outlook Express by using Secure Password Authentication.

“Server Error: 0×800ccc90, Error Number: 0×800ccc18″

Either the Outlook Express POP3 client is not able to access the mailbox because it does not exist or there is a custom recipient in the Exchange Server organization that has the same alias as you do, and Exchange Server is attempting to access the custom recipient before accessing your mailbox.
To fix these errors you should try to use Clear Text in Outlook Express.

To do so follow these steps:

Step 1: Go to Tools, click on Accounts. This will bring up several tabs.
Step 2: If you select any listed mail account, the Properties will have a Servers tab with the Log on using option.
Step 3: Select the Clear Text option.
If this works, then you were trying to access a non-existent mailbox or the wrong mailbox. If this does not work, then the administrator needs to check for and remove the custom recipient.

In this article you can find the steps after that you can change security setting for Windows XP and also Windows Vista. It’s recommended to follow these steps if some changes in the security changes have negative effects to the computer and when no backup is available from which to restore. This solution does not restore all security settings that are applied when you install Windows. To restore security settings to the default settings are two options.

Option 1: Automatically
Step 1: Click here
Step 2: Click Run in the File Download dialog box, and follow the steps in this wizard.

Option 2: Manually
The steps below do not apply to Windows XP Home Edition, or Windows Vista Home Basic and Home Premium editions. To restore security setting for Home editions, either uses the Microsoft Fix, System Restore or a backup.

Note: After security settings are applied, you cannot undo the changes without restoring from a backup. If you are uncertain about how to restore your security settings to the default settings, you must make a complete backup that includes the System State (the registry files). Items that are reset include NTFS file system files and folders, the registry, policies, services, permissions, and group membership.
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Error:” The following issues are preventing Windows from upgrading. Cancel the upgrade, complete each task, and then restart the upgrade to continue.

There is not enough free space on partition (drive:). A total of space_size megabytes (MB) of free disk space is required. Try Disk Cleanup, or moving files to an external location such as a CD, DVD, or external hard drive, and then restart the installation.”
This problem occurs when the virtual memory paging file is reduced below the recommended size. Windows upgrade requires that the page file be the recommended size, and it requires that sufficient space be available on the drive to accommodate a default sized page file. By default, Windows stores the paging file on the system volume. Therefore, there is insufficient free space on the system volume when you try to upgrade to Windows 7.

To resolve this problem, we have two options:

Option 1: Free up space on the system volume
Use Disk Cleanup, or try to move files to an external location such as a CD, DVD, or external hard disk drive. Then, restart the installation. Make sure that required free space is available on the system drive.

To free up space on your hard disk, Disk Cleanup finds and then removes temporary files on your computer that you decide you no longer need. If you have more than one drive or partition on your computer, you are prompted to select the drive that you want Disk Cleanup to clean.

Steps to start Disk Cleanup:
Step 1: Go to Start
Step 2: Go to All Programs -> Accessories -> System Tools-> Disk Cleanup

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This error can appear when you have been changed in the BIOS settings Serial Advanced Technology Attachment (SATA) mode of the boot drive to use the Advanced Host Controller Interface (AHCI) specification.

Error: “STOP 0×0000007B INACCESSABLE_BOOT_DEVICE”

The cause of this error is the AHCI driver (Msahci.sys) is disabled in Windows 7 and Windows Vista. This driver must be enabled before you change the SATA mode of the boot drive.

To resolve this issue, enable the AHCI driver in the registry before you change the SATA mode of the boot drive.
To do this, follow these steps:
Step 1: Exit all Windows-based programs
Step 2: Go to Start, in the start search box type regedit, and then press Enter
Step 3: It’s possible to receive the User Account Control dialog box, click Continue
Step 4: Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci

Step 5: In the right pane, right-click Start in the Name column, and then click Modify
Step 6: In the Value data box, type 0, and then click OK
Step 7: On the File menu, click Exit to close Registry Editor
Step 8: Restart your computer

It’s very stressing when your desktop icons did not appear properly, changed to different random icon; some of the icons become black or blue and so on.
This problem can be fixed, and the solution is to rebuild the icon cache (Iconcache.db).

To rebuild icon cache, follow the steps:

For Windows XP:

Step 1: Go to Application Data folder
(C:\Documents and Settings\Your User Name\Local Settings\Application Data)
Step 2: Delete the file named IconCache.db
Step 3: Restart your computer. (After you will restart your computer, windows will automatically re create the IconCache.db file.)

For Windows Vista and Windows 7:

Step 1: Go to Local folder
(C:\Users\You User Name\AppData\Local)
Step 2: Delete the file named IconCache.db
Step 3: Restart your computer. (After you will restart your computer, windows will automatically re create the IconCache.db file.)