In case you enter a discount code during checkout that doesn't exist or isn't currently active, then you can see the message: “Unable to find a valid discount matching the code entered”.

To use the Avg.com coupons on their website, you need to meet the conditions:

•  The items you choose must meet all coupon requirements as explained in the Terms and Conditions.

• The coupon has not expired. 

• The seller uses the Avg.com checkout system or a customized checkout system that accepts the coupon.

To avoid this problem, you should check out carefully Avg.com promo code before that promo code could be expired, some promo codes are tied to a minimum purchase, a first-time purchase, or tied to geography, and other reasons.

Firstly, you need to check out whether Avg.com offers Avg.com First Time Coupon Programs at that moment or not. If this program exists you can:

• Step 1: Sign up for a new Gmail, Yahoo, or whatever other email service provider that you want.

• Step 2: Complete your new Avg.com profile and start searching for Avg.com First Time Coupon.

Yes. Like all other stores, Avg.com offers a number of Cyber Monday Coupons. Don't forget to check the expiry date before making your purchase.