Did a search and found these......
Go to My Computer => right click on your hard drive => Properties => Tools. The second maintenance feature, Error-checking, is also located in the Tools tab. Please select both checkboxes in the Error-checking window. The next time you restart your computer, your hard drive will be scanned for errors and repaired.
or
After you log on to your computer and your icons/taskbar disappear do Ctr + Alt + Del and then click File -> New Task and when prompted type in regedit.exe. A new window will open up and you will need to go to the folder that says HKEY_LOCAL_MACHINE -> Software -> Microsoft -> Windows NT -> Current Version -> just click on winlogon once, do not expand it.
Then you will need to locate Shell on the right hand side. Right click on Shell and change its value to explorer.exe if it isn’t already.
