<human>: In an effort to improve my credit rating two years ago this month I opened two secured credit cards. 

Last July  after having no late payments and acquiring an automobile loan for a new car I applied to have the cards converted  to unsecured cards. One card went ahead and approved my application the other one refused it.  So I tried again six months later with absolutely no late payments or overages on any of my department store cards or these two Visa cards  and the  remaining secured card refused again to approve the conversion.  Finally this month I applied a final time for the conversion and I just got the rejection letter today.  

My question is if I go ahead and cancel this account how severely will that impact my credit and for how long (if at all)?

Give me a shortened version of the text
<bot>: Does closing a secured credit card after two years have a negative impact on ones credit rating  and if so for how long?