I have purchased Simple Malware Protector but it will not remove the malware infections found

It is very likely that the product has not been registered.

You will need to register the product using the license key you purchased before you can scan and remove malware infections. If you do not register the product, it will continue to remain in trial mode and will ask you to purchase or upgrade again.

To register the product, click on Register Now option on top right corner of the program window. In the new window that opens, copy and paste your license key into the text field, avoid typing it manually. Next, click on the Register Now button to successfully register the product.

Activation guide here

Once you have successfully registered the product, you will unlock the full functionality of Simple Malware Protector and be able to removal all the threats and infections found on your PC.