Hi and welcome to TSF.
You may need to uninstall Norton before re-installing. If so, you'll need Norton's removal tool
http://service1.symantec.com/SUPPOR...f&view=pfdocs&dtype=&prod=&ver=&osv=&osv_lvl=
I've used free AV's for years without any problems. Have a look here for a general guide to PC security
http://www.techsupportforum.com/f174/pc-safety-and-security-what-do-i-need-115548.html
While Norton is most likely the source of your slow system, there can be other factors as well - have a look here
http://www.techsupportforum.com/f174/is-your-pc-running-slow-247566.html
You may need to uninstall Norton before re-installing. If so, you'll need Norton's removal tool
http://service1.symantec.com/SUPPOR...f&view=pfdocs&dtype=&prod=&ver=&osv=&osv_lvl=
I've used free AV's for years without any problems. Have a look here for a general guide to PC security
http://www.techsupportforum.com/f174/pc-safety-and-security-what-do-i-need-115548.html
While Norton is most likely the source of your slow system, there can be other factors as well - have a look here
http://www.techsupportforum.com/f174/is-your-pc-running-slow-247566.html