Unable to see hidden files

A virus called HEAP41a it will be loacted in c drive.. to view itgo to c:\heap41ajust copy and paste the thing in the address bar of my computer.. delete all the contents of the folder then follow this thing

• Go to your Start menu, click on Run and open up your Registry Editor by typing "regedit" without the quotes and pressing OK.
• Once there go to: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folde r\Hidden\SHOWALL
• Delete the value CheckedValue. (Its type should be REG_SZ and data should be 2.)
• Create a new DWORD value called CheckedValue (same as above, except that the type is REG_DWORD) by right clicking on the right pane->New->DWORD Value. Modify the value data to 1 (0x00000001).This should let you change the "Hidden Files and Folders" option.*Modify the Registry carefully. One wrong move and you'll screw up your PC !