I get following blue screen after running my laptop for an hour...

A problem has been detected and windows has been shut down to prevent damage 
to your computer. [...]

Technical Information: *** STOP 0x0000008E (0xc0000005, 0x805B03F5, 0xF703DC7C, 0x00000000)

[...]

So how can I tell if this is faulty memory or some other hardware problem?

My laptop is a Toshiba Satellite A45-S250.

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i'm sorry, "where can i buy..." questions are offtopic here; Super User isn't a shopping site. we can help you figure out what the trouble is, so i've edited your question to ask that. – quack quixote May 7 '10 at 4:15
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2 Answers

I seems that the stop code youve got is generally related to RAM, but not always so. Sometimes it can be caused by driver errors. I would recommend reading this About.com on STOP codes. It has helped me in the past.

Also, to test for a RAM error try running the Windows Memory Diagnostic. This should help you figure out if it is a RAM problem.

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If you feel up to it, you can analyze your minidump files that are created when you get a bsod.

http://support.microsoft.com/kb/315263

Or you can upload your .dmp files somewhere we can download them to analyze for you.

.

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