Registry Clean Software PC?

I’m trying to find a good Registry Clean Software for my PC. I see to be slowing down. I run Malewarebytes, and Avast! anti-virus and my windows XP SP3 seems to be slow got 3 gig Ram in the machine also. haven’t seen my computer this slow in a long time any one know any free Registry software or test programs that would be great.

I did a clean install of Windows XP SP3 on my laptop and then when I went to my network connections my wireless is not showing up. I checked all the drives and they are fine and then network adaptor is fine but still not seeing my wireless tried to create a new wireless network and nothing still…I am not that computer savvy so just wanted to know if anyone knew what the problem could be?
It’s a gateway laptop MX6425– my router is a belkin…I’m on my desktop but have my laptop and there is no wireless connection showing only the Network Adapter Connection shows..I already did the whole Download the drives to flash drive then to laptop and still nothing. I looked in device manager and my network adapter is fine and disabled and enabled.
All the drives are installed and fine but still nothing, no wireless connection. I do appreciate the help guys!