Make my computer run faster

Question

I hope I can get some help here; Recently I purchased Fios in a hope that my computer would run faster after Fios instalation, but no difference at all, then I asked the technician at verizon, they forwarded me to another verizon department to register for a service which will help about the computer run better, and that is $14 a month.
Is there any other easy way or trick that makes your computer run faster, or what actually causes the computer to slow down? My friend told me that if you don't delete the long emails will slow it as well, is it true?
Any experienced input will be appreciated

Answer 1

 There are a number of things that may help, but none of them are likely to help a great deal unless your computer is infected with one or more viruses/malware.
1). If  any of your HDD's partitions  FAT (as opposed to NTFS) format, defragmenting the disk may be helpful. In general NTFS partitions don't need to be defragmented. 
2). Get rid of the temporary files. It is not uncommon for PC's to end up with literally gigabytes of temporary files. They are left over from software updates, installs, and Internet Explorer SNAFU's. (Do this BEFORE you Defragment the disk).
Most temporary files either live in directories called temp, have names that start with ~ and/or end with .tmp
3). Clean up the registry. While Windows will usually still run with a truly amazing number of registry errors, it usually runs better with a lot fewer of them. Software you see such as 'speed up my pc' advertised on Television are in fact registry 'cleaners'. The registry in windows is kind of the like telephone operator before the days of dial telephones.  There are a number of commercial products that do this, but in general you are going to have to buy one.
4). Unless you are running Vista or Windows 7, try Verizon's high speed internet optimizer to tweak some of the internet settings for better performance.
5). Uninstall any software that you aren't using.
6). Use a good anti-virus/anti-malware/spyware program, and scan your HDD's on a regular basis for viruses and other malware.
Cleaning up your emails is very low on my list of things that are likely to be helpful.