I hope you have the backup of the wallet file (.dat). If not then make a copy and keep it in a safe place.
Now here are few things you can do:
1. Like
OmegaStarScream said, if you have the seed (you should have) then restore the wallet with the seed.
2. Uninstall the current Electrum software then download it from the official website (
https://electrum.org/#download). You must verity the downloaded file (
https://bitcoinelectrum.com/how-to-verify-your-electrum-download/) before installing.
3. Paste the copied wallet file (.dat) in the wallets folder (....\AppData\Roaming\Electrum\wallets) if it's not there. <== assuming it's windows system and you have installed the software in it's default directory.
4. Check if you have the CAPsLOCK on/off issue.
Good luck.
Edit:
Why don't you just tell them to edit their subject?
Yape.
OP: You may consider updating the topic title. It sounds like you are having issue while installing the Electrum software.