A list of Windows shortcut keys can be found online on the Microsoft Windows website. To be sure that the list of short cuts is relevant to your PC, be sure you have the list that pertains to the version(XP, 7, 8) of Windows you are using.
Finding the list of shortcut keys in the Windows operating systems can be found in a couple of major locations. The most common is the Microsoft site itself, with others including Computer Hope and Google Support.
If I understand the question correctly, you are describing the malfunction of two specific keys on your keyboard. If this is the case, you probably need to replace the keyboard. The two keys work 100% fine in other shortcuts and in single use. its just this one shortcut.
Backspace
You press the key, then quickly release it.The meaning of the keys varies, depending on the program you are using. F1 often means "help", but the meaning given to the other keys varies a lot, from one program to another. Usually you will have a menu in a program; next to the individual menu options, there will be shortcut keys which you can use instead of the menu option. Some of those shortcut keys may include function keys.
Shortcut
alt+tab
Keyboard Shortcut
ALT+TAB
Alt-Tab; hold the 'Alt' key in, and press 'Tab' until the window you want to use is selected. The, release both keys.
One can find a list of free product keys for Windows Vista on PSP Support and UDG ed. Other places to find the product keys for Windows Vista is on Social Tech Net.
Control and Down arrow
Hold down the Alt key and type 148öWell, I looked through over the Character Map in order to find it.Just use the following shortcut keys to produce this character, one for the upper case, one for the lower case of the character:Alt + 0214 ÖAlt + 0246 öNote: when performing shortcuts, you must press & hold all the keys in the shortcut altogether....