The Internet Explorer browser is prone to damage from viruses and Trojans. There are several ways to fix errors within IE. One way is to repair IE with commands in DOS. Commands are simple requests given to the computer to perform a task. The computer can delete, fix, move and rename files through the command prompt. If your IE is corrupted and will not open, your system probably has Registry errors that are affecting Internet Explorer.
System File Checker
Go to "Start," then "Run" and enter the command "cmd." Hit "Enter" and wait for the command prompt box to open.
Type the command "sfc /scannow" without the quotation marks and hit "Enter." Wait for the computer to start scanning the computer for errors.
Insert the Windows installation CD-ROM in the disc drive when you see a pop-up box that asks you to perform this task. The computer will automatically fix any corrupted files.
Reregister IE Files
Go to "Start," then "Run" and enter "cmd" without the quotation marks to open the command prompt.
Type these IE files exactly as they appear and hit "Enter" after you type each DLL. This operation restores missing or damaged Registry files.
regsvr32 softpub.dll regsvr32 wintrust.dll regsvr32 initpki.dll regsvr32 dssenh.dll regsvr32 rsaenh.dll regsvr32 gpkcsp.dll regsvr32 sccbase.dll regsvr32 slbcsp.dll regsvr32 cryptdlg.dll
Close all windows and reboot the computer to save changes.