Norton and McCafee are two separate companies providing anti virus programmes. Unusual to have BOTH loaded on a machine. If you had both operating at the same time its highly likely they were fighting each other rather than helping you. Either are reputable companies and products. Current experience with Norton is VERY GOOD, recommended actually, McCafee less so.
Sorry but its FAR MORE LIKELY to be Win 7 playing up rather than Norton, even if you had the two A/Vs running together, IMHO. If your determined not to use ONE of these two, then I second
Microsoft Security Essentials. Excellent product, even more so being free. Light on resources, works well. Fit and forget. (Providing you have removed ALL TRACES of ALL OTHER A-V PRODUCTS).
As to your web suggestion, no experience of, but theres plenty of re badged stuff to spend your money on, IF you really want to.
