yes and no
it did when it first came out it made many old malware obsolete, because if someone clicked on it a popup would ask "do you want to give it administrator rights", and administrator rights shouldn't be required for a random piece of software
but not much any more.
Most virus writers know how to do their thing without needing administrator rights.
link:
http://nakedsecurity.sophos.com/2009...-8-10-viruses/
think about it this way
the hacker would first penetrate your system using a remote buffer overflow
http://en.wikipedia.org/wiki/Buffer_...w#Exploitation
the hacker would then install a keylogger on your computer
it would log every key you type, and send it to the hacker.
both steps don't require UAC, and it would give the hacker your UAC password
Anyways, my advice
Are you behind a NAT?
aka, go in command prompt, and type in:
ipconfig
find your IP address, if it is something like:
10.*.*.*
or
172.*.*.*
or
192.168.*.* you are safe from most remote exploits
If not, get yourself a route
Now you should check for viruses and malware
Get your torrents and porn from reliable sources.
Beware of browser attacks, only go to reliable sites.
Get yourself a decent antivirus software
if your still getting hacked, you will need more drastic measures.
You might want to consider a network based firewall/ids
its not cheap though, but if the hacker hacking you can tunnel through you NAT, its probably a reasonable choice
Try a virtual machine or a separate computer for porn, torrents, and other internet uses.
Encrypt your sensitive files, use a good encryption software(i recommend true crypt)
The price of a network Firewall/IDS is quite expensive, so you might want ton consider a host based IDS like Snort