can anyone please help me with the registration key for spyware nuker xt?

For spyware solutions, Spybot is great. If you are willing to try Microsoft’s beta, consider defender. Both are currently free.

http://www.safer-networking.org/

http://www.microsoft.com/downloads/details.aspx?FamilyID=435bfce7-da2b-4a6a-afa4-f7f14e605a0d&DisplayLang=en