Do some reg. cleaner freeware create probs.?

i downloaded two diff. freeware reg. cleaners both with the options to buy the full version.. here is the problem, one of them said i had 27 reg. problems to fix, the other said i had over 200.. the real question is do some of these freeware programs actually create some problems just to get you to buy the full version to fix them? they both were from reputable company's.