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Think you don't need to upgrade.
The most frequent reaction on a underpowered system is crashing caused by the video card. Those suckers draw a lot of power. (your Geforce 4 Ti4200 AGP Gfx sure does)
You can test it by running a very processor and graphic card stressing program. for example Unreal Tournament 2003. If you run those programs, processor will be 100% full time, graphic processor too. If your game, with maxed out settings, runs fine (witch it will with your system) everything 's ok. If you get a crash or are throwed back to desktop immediatly(memmory exeption), maybe it's your PSU.
If it first runs fine, then crashes, maybe it's your PSU or maybe you have insufficent cooling.
I don't think your IE problems have anything to do with your PSU.
I know this is not some expert answer, but maybe it'll help.
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Amerika by Franz Kafka
“As Karl Rossman, a poor boy of sixteen who had been packed off to America by his parents because a servant girl had seduced him and got herself a child by him, stood on the liner slowly entering the harbour of New York, a sudden burst of sunshine seemed to illumine the Statue of Liberty, so that he saw it in a new light, although he had sighted it long before. The arm with the sword rose up as if newly stretched aloft, and round the figure blew the free winds of heaven.”
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