What makes Norton run slow?

MY Norton Anti Virus software takes a long time to scan my computer. It started out scanning in 30 minutes, then I added Norton System Works and it started taking 90 minutes which I attributed to the fact that it is now doing a more extensive scan. But about 2 weeks ago it started taking 2 1/2 hours and last night after 2 1/2 hours, it was still scanning Program Files so I cancelled it because I had to shut the computer and get to bed. Does anyone know what would cause this software to scan so slowly?

What makes Norton run slow?anti virus

As a rule, Symantec Norton software programs are notorious for being resource hogs. But, Norton's Antivirus and System Works are excellent tools. Here are some suggestions to speed up Norton Antivirus scanning. First, delete all obsolete files. The more files on your computer the longer it takes to scan. If you are using Internet Explorer then use Windows' Disk Cleanup utility go to Start %26gt; All Programs %26gt; Accessories %26gt; System Tools %26gt; Disk Cleanup. Make sure the following items are checked: download program files, temporary internet files, recycle bin and temporary files. You can choose to compress old files or not.

In addition, turn off automatic system hibernate or standby on your computer. You can do this by going to Start %26gt; Control Panel %26gt; Display %26gt; Screen Saver tab %26gt; [Power] button and make sure "turn off hard drive," "system hibernate" and "system standby" are set to Never.