I Have Nortons Internet security at the moment which scans for Spyware and ad-Ware on my computer. Does this cover me totally or do I need other Spyware detection software on My P.C?
Also if I do Have Other Spyware Detection Software will it conflict with Nortons? I have windows Xp Home.

Using more than one anti-spyware program increases your protection coverage. No single program on the market can claim 100% detection/removal so using more than one is recommended. Each vendor has its own definition of what constitutes spyware and scanning your computer using different criteria will yield different results. The fact that each program has its own definition files means that some malware may be picked up by one that could be missed by another.

As such, I would recommend that you use both Spybot and Ad-aware in addition to your other programs. Using them will not cause a conflict with Norton.