Thanks to everyone for their suggestions. Sorry for the delay, I thought I'd receive email updates to my post, but I didn't.

I managed to gain access to my coins. This is the route I followed. 1. Tried the BIP-39 seed option, that resulted in getting into my wallet, but nothing was there. 2. Accessed the application data from my backup. 3. Copied the wallet from there and placed it in the wallets folder on my PC and chose to replace the existing folder.

Originally, I copied the whole Electrum folder from my backup and overwrote the one on my PC, but that didn't work.

Regarding Windows 'refresh', I have the latest version of Windows 10, it actually prompted me to consider a refresh. This keeps some programs, but removes quite a lot. Files stay intact. It has improved the running of my PC.

I tried your suggestion, but it took me along another route where it asked for a new password and the old seed phrase and I ended up with a wallet with nothing in it.

I recently decided to refresh my Windows 10 system, which basically saves all files but removes some programs.

One of the programs which was removed was Electrum.

After the refresh, I reinstalled Electrum. According to their documentation section on their site, this is what should be done to gain access to my wallet: "To restore your wallet from its seed phrase, create a new wallet, select the type, choose “I already have a seed” and proceed to input your seed phrase."

I did this, but when I entered the seed phrase, the 'next' button was greyed out, so I couldn't proceed to the next stage.

I had a backup of Electrum on an external hard drive, so I copied the Electrum folder and replaced the one on my PC with this, but it still didn't work.

The seed phrase I used was definitely correct.

Can anyone help solve this problem, please? Any help will be appreciated.