Windows 7 tells me to activate windows

[Krupa]

Hey!
I had downloaded Windows 7 and i got a registration key from microsoft. But when i installed windows 7 after some days, it refuse to start telling me to activate windows? What must be the problem? Windows 7 is awesome and i want to use it for further period till the retail version is out...! How do i make it use again? Help me Guys!

[FaMe FacToR]

Hey!
Thats pretty simple. Make sure your internet connection is on and let windows activate it for you... You can also activate it by phone... Refer to microsoft's website to know about it...!
All the best...!

[SmirnOFF]

Hey!
If you already had activated windows 7 before and again getting this prompt, check your date is valid. Go to bios setup and change your date... Windows 7 will only be valid upto 1st August 2009. This is a security feature so that nobody misuses it after the Beta has expired...! All the best...!

[Krupa]

Hey Guys!
Thanks for taking sometime out and replying me... But i got it solved. I just did a system restore by entering in the safe mode...! Thanks though...! Well i didn't knew that windows 7 beta will be valid only till 1st august...! Thanks for that...