Should I uninstall trial version programs once their trial period expires if I don't want them

e.g. my pc has Trend Micro Anti-Spyware Basic which is expired. I am using different anti-spyware which is free.

Should I uninstall trial version programs once their trial period expires if I don't want them anymore?anti virus protection

Yes, Uninstall it, otherwise they will keep bugging you to renew it

Should I uninstall trial version programs once their trial period expires if I don't want them anymore?antivirus

It's better if you uninstall the trial software. I'll also advice you to clean up your computer's registry from time to time. There are a number of free anti-spyware software out there to download.
Yes because they are all used up and taking room on your Hard Drive...plus like the person before me said..they'll bug you to buy the real version....
most virus are spread through IE. IE is not a safe browser. you should use a more secure browser to protect your PC from virus.

i recommand you to use firefox with Google toolbar. firefox can block any any popup and disable any virus and adware, spyware on webpage, so, firefox is much safer than IE browser. as you know, most of virus spread throught internet and webpage.

besides, firefox is much smaller than IE, so it run faster than IE.