How do I fix a slow iMac?

My iMac is very slow in performing very basic operations like opening windows. It's also slow using the internet and I have an ipad on the same wifi system which is much faster. I think something must be wrong like the RAM is full or something like that. How do I diagnose and then fix the problem?
Thanks!

Thanks for your help!      I'm not running any antivirus or crapware.
Information is below:
Model Name:          iMac
Model Identifier:          iMac7,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          2.4 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          4 MB
Memory:          2 GB
Bus Speed:          800 MHz
Boot ROM Version:          IM71.007A.B03
SMC Version (system):          1.20f4
Hardware UUID:          00000000-0000-1000-8000-001B63B24D0D
Capacity is 319GB and available is 123GB

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