my windows OEM is no longer activated

i hope i dont sound to confusing but im go step by step..

So the sandy, the hurricane came and cut the power while the computer was on. power came back on after 3 days. i cut the computer on and it said that startup has failed. so the computer tired to do the auto fix. But then it failed and shut down. I cut the computer back on and i had a horrible long beep maybe a full second. then it sent to system restore because of a windows problem. i tried the restore but then that failed because a steam file. when that was finish its sent to log into computer. at this point i am confused because im on the computer when it say that start up has failed. i didn't know what esle to do so i just shut down the computer and cut it back on and the long beep was gone. it started up as normal. However under system it say that i have 8 days to activate windows. i don't know how to fix this problem. it should say windows is activated.

Use the Product Key from COA sticker to activate at Control Panel>System.

Using the Win7 DVD or System Repair Disk run Startup Repair - Run up to 3 Separate Times no matter what it reports.

If problems persist give it a good going over using these standard Troubleshooting Steps for Windows 7