Get one registered and if it does not do what it says return it for a refund.
Years ago I listened to users on CNET telling what a good virus suite program called ????? was and I took it for a run and asked for a refund in 10 days. The only software I have ever asked for a refund on.
There are plenty of other threads you can read on registry programs without commencing another one.
Do trial versions of Registry boosters/optimizers force you buy their program by "discovering 1028 errors" in your registry while at the same time the registered programs discover only 8 errors?