How do I speed up my Windows Vista,1gb RAM laptop?

I have a Sony Vaio AGN AR series laptop, its has a 1 GB RAM and runs Windows Vista, almost 2 years old, it runs ok , as standalone but when connected to the internet, it becomes excruciatingly slow the first IE session runs fine but the 2nd window(or the tab) takes almost 2-3 min to open after the click on IE... show more I have a Sony Vaio AGN AR series laptop, its has a 1 GB RAM and runs Windows Vista, almost 2 years old, it runs ok , as standalone but when connected to the internet, it becomes excruciatingly slow
the first IE session runs fine but the 2nd window(or the tab) takes almost 2-3 min to open after the click on IE icon , hereby making it really slow, and starts eating the whole memory, IT ALMOST HANGS
I have tried , lookingfor Spyware,Malware, Viruses ,and it shows nothing ,
Also tried defragmenting, and Disk cleanup but no change....

Is there anything i can do before upgrading RAM and switching on to Windows 7

Please HELP !!
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