It is very unlikely that you have 8 GB of memory in your laptop. But if this is for real then it is better to switch to Windows 7. Windows XP 64 bit has very limited support what includes limited driver availability and Microsoft have discontinued it's support.
You are on a page that is part of Computer Troubleshooting Guide. If you have arrived here not from the start I suggest you click here and start from the beginning. The software will ask you some questions and it will try to solve your computer problem.
If you arrived here from the start please continue as normal.
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