Need Solution to Work Windows 7 Gadgets Properly

I was happy with the XP operating system in my HP Pavilion notebook. Few days ago I have seen Windows 7 in my friend’s laptop.
I was amazed by the outlook of Win 7 and decided to install it in my notebook.
Finally,I bought a copy and installed it. For a first couple of days it was ok but I am having a little but weird problem with the desktop gadget now.
The gadgets don’t appear properly.
For example,a blank calendar without date or sometimes all the gadgets just vanished.
How to repair it?
