Dell Laptop Inspiron N4010 Intel i5 M450 @ 2.40Ghz 4Gb Memory 64bit running really slow win7

Hello I have a dell laptop Inspiron N4010 Intel i5 M450 @ 2.40 Ghz 4Gb Memory running really slow, I have clean the start up, defrag drive. In task manger under performances the memory really starts off about 50% after a clean start up ... running free avg 2015 outside of that not much beside chrome, office 2010... Would you upgrade the memory to 8Gb or reload, suggestions?
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It is hard to say. The speed is often a subjective impression of the user, and it is possible that everything is fine. The RAM should be enough for your needs.

Did the PC originally come with Windows 7 installed? Or did you install it yourself? If you did the installation, did you install all the PC's drivers, particularly it's chipset drivers? Having the correct drivers usually influences the speed. Did you make sure the BIOS is using the correct settings? For example that the Disk controller is set to AHCI mode, and not compatible or IDE mode?
Natty GregIn Theory (IT)Commented:
its not necessary to upgrade the ram, you may have malware and or virus thats consuming your resources. windows update normally overtime eat up resources also.
run these for anti-malware :                         MBAM                  Roguekiller

if nothing is found, i suggest a clean install (after a couple of years, most OS'es get loaded with program remains) - either from install CD, or recovery partition or media

when everything is installed (drivers, software, updates) - make an image of the drive, so you can redo this operation quickly
you can use the free paragon soft :

***if you really want a faster system, shell out some cash, and install an SSD drive :

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