arun gupta,   The registry cleaners have messed up your computer. The only way to get things working is to restore the computer back to factory.   If you made the Windows 7 - IMPORTANT Windows 7 Backup Disks to create Restoring Your Dell Computer to Original Factory Installation with Dell DataSafe Local Backup 2.0   Restoring Your Computer´s Software to the Factory Settings   How To Restore or Reinstall Microsoft® Windows® on a Dell™ Computer     Rick
Dear PudgyOne, i am usiing inspiron 1525 with windows 7 32 bit. while opening a mp4 file or any other file (pdf etc. any one)  by right click and  "open with" command the follwing error pops up. But by going in default programs control panel it is working ok. but still the same error comes while using the "open with" operation. The file does not have a program associated with it for performing this action. Please install a program or, if one is already installed, create an association in the Default programs control panel.   Dear please let me know the solution for the same. arun gupta
The file does not have a program associated with it for performing this action. 
Please install a program or, if one is already installed, create an association 
in the Default programs control panel.