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Microsoft Windows 7 Repairs in Laptop

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Microsoft Windows 7 Repairs in Laptop

guruitech
Dear Sir/Madam,
My system configuration is Microsoft Windows 7 Professional.

All programs in the start menu has been applied the one program extension to all another programs in the start menu. which means that the notepad extension has applied to the ms office,word pad and another programs in the start menu. This problem only on the start menu,this problem hasn't into the hard disk,removable disk and my documents,libraries in the system.The libraries,my documents folder in the windows 7 and removable media has the ms word,word pad, notepad documents.but which has it's own extension separately.
but, the start menu contained programs has been applied the same extension(properties),even, i opened a admistrative tools from control panel. which has applied the start menu contained programs extension. thereby,my system was fully scanned with the help of antivirus,the scan report showed the viruses in my system. I cleared the viruses from my system with the avast antivirus. but, the problem is not cleared.
What can i do for that repair?