I run Windows XP and norton anti virus but I still get viruses so I downloaded AVG but I'ts making my machine run slowly - do I need both? Can I get rid of Norton and still be protected? How can I speed up my machine? I've run disk cleanup, I don't have temp files cloggin it up, since downloading AVg my machine sometimes freezes - help please?

Get rid of Norton soonest I have found that 75% of the people that run it have problems with XP.

You only need one on system scanner, but it never hurts to use an online one once in a while.
Trend Housecall (http://housecall.trendmicro.com/) is an excellent online scanner, does spyware as well.

Hi,
I agree with Curlyben; get rid of Norton.
You might already know how, but just in case:
Go to Control Panel, then Add/Remove Programs. Left click on Norton to highlight, then click on Remove; just follow the windows' instructions.
There usually are problems trying to run two Antivirus Programs at the same time.
This might account for the slower computer.
I switch from Norton to AVG about 3 yrs ago or so; and have NOT had any virus get passed it! It has caught many, mainly through emails. It checks both incomine and outgoing email.
You might also consider a great, free cleaner, works better than Disk Cleanup, from: http:www.ccleaner.com. Just two clicks gets rid of junk files, temp folders, some never used Registry entries, etc.
Also, AVG allows downloads, almost daily of new Antivirus definitions, one at a time sometime; instead of waiting to "compile" many at the same time.
They are available as soon as they are ready to be released!
Best of luck.

I don't think you were but just in case I'll say it - don't run two antivirus programs at once. It'll just cause a lot of trouble and there's no benefit from doing it. I also believe that two virus scanners can sometimes try to read the file at the same time, causing slowdown etc.

I'll agree Ben & Fred's advice - Norton isn't as great as everyone believes it to be.

As for the speed issues - try some adware scans as well (few links in my signature)