Your private key/s are actually all what you need, so take pooya87 advice and export your private keys first. But in that case be sure that you have clean PC without any virus/malware because private keys are very sensitive information which should not be saved in text format on device which have access to the internet.

Regarding backup of Electrum files on Windows 7 follow these steps :

Click on My Computer - Select Local Disc C - Users - Your User Name (Home) - Tab Organize/Folder and search option/Under View Tab click Show Hidden Files - Then click folder App Data - Roaming - Electrum - Wallets. Copy/Paste wallet folder anywhere you think is safe - maybe USB stick.

When you have backup of private keys and your wallet/s file then just upgrade Electrum by visit https://electrum.org/#download and select Windows - Windows Installer. After install you should have latest version of Electrum with your coins and no problem with sync.