Sorry, i can’t speak english…..
my recommendations:
1. Kaspersky internet security 2010
=> kaspersky have powerful heuristic and kaspersky have actual database with complete protection. but, kaspersky is sensitive and difficult to use.
2. AVG 8.5 internet security
=> AVG is light and fast. but, avg doesn’t have good heuristic.
3. Avira antivir 9
=> Avira is good too. but, last week, sality on my computer destroyed
Avira “Antivirus guard”. luckily, AVG resident shield detected all sality.
4. Bitdefender total security 2009
=> slowdown my computer… but, bitdefender more lighter than norton (^_^)
5. Eset smart security 4
=> more lighter than KIS 2010 (kaspersky internet security)….

Kaspersky is more expensive, how is one better than the other? Please give info rather than giving me the website.

Im using Windows 7 32 bit ultimate, till date i was using bitdefender total security 2009 and im satisfied with its performance. Now i need to switch to some thing else, bcoz bitdefender 2009 is not working in windows 7.