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I am using WIN XP with 192MB RAM on Pentium III 500. Now I increased my RAM to 256MB. Is necessary to reinstall the OS to speed up the PC. ? Will the performance be better by increasing from 192MB to 256MB ?

You already have 256mb. 64mb is used by your graphics adapter.
Your next step would be to 512. It's likely (but not a given) that you will get some improved performance. It really depends upon how much memory you need for your normal operations.

>>>Your next step would be to 512. It's likely (but not a given) that you will get some improved performance.<<<
Agreed, and a jump to 1GB would be even better (if the machine can handle it). But at that point you're looking at the cost of a CPU upgrade (and the cost of an entire new system wouldn't be much beyond that). Depending on what you need to run, it's quite likely to best save the money for the new system...

and in answer to the other part of your question, No you would not normally need to reinstal the operating system after adding more ram.
I used to have a signature but it disappeared and I just couldn't be bothered writing another so please feel free to ingore this.

i am using virtual memory by win xp, so no need to waste money to buy RAM. MY V.Memory is 8 GB.
go to system properties/advanced/performance/advanced/virtual memory, change and last custom your initial size ,max size.then, go to CLT-CTL-DEL to see the ram being used.. stil can't email..
good. "duck"

>> i am using virtual memory by win xp, so no need to waste money to buy RAM. <<
That demonstrates a total misunderstanding of what virtual memory is, what it does and how it works.
Virtual memory is stored on the hard disk. It is generally brought into use when the system run out of real memory. It is slow, very slow, compared to real memory and becasue the system can spend so much time swapping stuff in and out of virtual memory, it slows down other disk operations as well.
8GBs of virtual memory is bordering on the ridiculous most of which will never get used anyway. The maximum amount of memory a PIII can deal with is 4 GBs, virtual or otherwise.
Stuart

shejintr,
If you to wanna attempt to optimize the virtual memory settings, do it correctly. Please don't listen to aquagriculture. 8GB? That's freaking reeediculous!
"The recommended minimum size is equivalent to 1.5 times the amount of RAM on your system, and 3 times that figure for the maximum size. Example, if you have 256 MB of RAM, the minimum size would be 384, the maximum size would be 1152."
http://www.petri.co.il/pagefile_opt...
192MB RAM is not enough to run XP well. Even 256MB is barely enough. You'd be much better off with 512MB. The performance difference going from 192MB to 512MB *should* be significant.

My vote is on 512mb's at least. Plus, P3 are a dime a dozen on eBay these days, upgrade that CPU!

If your trying to free up your RAM, try uninstalling those unneeded programs/ software that come with your computer.
I'm talking about the ones that, let's say (HP) would add onto your OS such as XP.I found I didn't need the updater that came from where I bought my computer :)
Anther thing would be to shut off anything that would cause memory waste or would be saved in memory. This would speed up your system!

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Cursor bouncing all over ...
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XP Infected by Virus
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