My OS is windows 10
I'm running Electrum v3.3.4, just fine on Windows 10.
Have you checked for system updates? "Start -> Settings -> Updates and Security"
Make sure you have downloaded and installed all updates... AND that you have restarted the PC... see if that fixes your problem before worrying about downloading unnecessary updates using KB (knowledge base) articles.
If it doesn't, it might be that your wallet file has become corrupted. Users have had issues in the past with a corrupt wallet file causing this error (Electrum attempts to open the last used wallet file automatically on startup).
Do you have your 12 word seed mnemonic backup? If so, you can try the following to see if it helps.
Firstly, uou will need to move all the wallet files from "C:\Users\[YOURUSERNAME]\AppData\Roaming\Electrum\wallets" to a temporary location. NOTE: if you cannot see the "AppData" folder, you can either press Start and type: %appdata% and then press enter or you can follow
the directions here for showing hidden files/folders.
Make a backup of all those wallet files, then delete them from the %AppData%\Electrum\wallets folder... Once you have deleted them, try starting up Electrum. If it opens OK, then a corrupt wallet file was causing your problem. You can now restore your wallet using your 12 word seed mnemonic backup.