Update:
Microsoft has DISABLED the weather and currency gadgets via a recent Security Update, due to concerns over the vulnerability associated with these gadgets running on your computer. You can read more about it here: http://support.microsoft.com/kb/2719662 . Adjusting your computer's settings and all these other "suggestions" people are making, will NOT work. The function has been REMOVED from the operating system. It has also been removed from the Windows 8 operating system. There are "theorists" that either agree that there is a security issue within the gadgets or Microsoft just does not want to support gadgets (usually third party software) and thus, has disabled them in Windows 7 and eliminated them in Windows 8.
Thanks to DaveNYC for the Info. Spread the word because many people are facing this problem just like you.