Increase System Speed

How to Speed-Up your PC.

What speed you are talking about if you upgrade your RAM it does not mean your system will be fast in all blocks. Eg system never uses more than 10mb of ram to startup so there will be no change in your system in this block.

To improve your overall system speed
1. Download CC cleaner it removes unwanted junk in easy steps. From http://www.ccleaner.com/

2. Download prefetch utility and set ENABLE BOOT PREFETCHING so your boot process is fast from http://www.majorgeeks.com/Prefetch_Utility_d4942.html

3.Go to "Start-->Run" and Type defrag c: -b to defragment the Boot and Application Prefetch

4. Download User Profile cleaner to make shutdown faster from http://www.softpedia.com/get/Security/Secure-cleaning/Microsoft
-User-Profile-Hive-Cleanup-Service.shtml

These utility will help you gain some speed also use lightweight AntiVirus softwares the best i think is AVAST Home edition
--Its free
--Less resource eater
--Residential shield rocks
--Internet Shield
--P2p Shield
-- Customizable skins.
-- Daily updates some time every 2 hour.
and more features like schedule scan on windows and boot time scan,
Totally it rocks go for it you will love it www.avast.com
also download update and install them both, and first do a full system scan to see how much virus your system silently holds.

Also use Spybot S&D to remove most of spywares out there dont forget to up date get it from http://www.safer-networking.org/en/download/index.html

Last but not least use Dr.Web CureIt! to clean almost each and every unknown adware, Spyware, Trojans and worms from http://download.drweb.com/drweb+antivirus+free+services/#0

Iam sure after doing all this your system will improve a lot on performance.

For extreme Tech geek
Service
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You can also use services just type services.msc in run dialog box and DISABLE some service you dont use like those which are for networks, read the description carefully before tweaking.

system configuration utility
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Also remove unwanted start up by using "system configuration utility" type msconfig in run command and navigate to Startup tab and uncheck those you dont need.