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wifi not stable

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usualy i am able to fix almost any computer problem. but this time i really dont know what to do

wireless is not stable, sometime it completely crash. my gf is unable to play any game because of that. also she have to use my pc to do research for work because of that

to start off here are the spec:
windows 8 hp pavilion laptop
wireless card: RALINK rt3290 802.11bgn (driver log have over 2000 red alert on connection timeout)
factory setting, brand new.
current router is a good quality tp link, high security with mac adress
looked with a wifi analyzer and the current frequency used is almost not used by other wifi in range
also only my gf laptop seem to have connection issue. lot of device had connected to the router

router mode 11bgn mixed, channel width automatic,
Firmware Version: 3.12.11 Build 120320 Rel.51047n
Hardware Version: WR740N v4 00000000

laptop is 2 meter away from router


what i did so far: download the good driver specified on hp website for the exact model. wifi crashed, needed to restore system.
adhoc support 802.11 n enabled (disable by default ...)
disabled power saving feature to turn off wireless card (why is this thing on by default? i mean it cant help in any way...)

tried lot of tutorial because it seem to be a common problem on windows 8. not did a difference.

posted issue on hp support forum. tons of people have the same problem with hp laptop on the forum. never had any answer. my gf is getting really annoyed. if we cant fix this we send it back.

tomorow i will look for a update for the router.
sometime it wont connect to any wifi at all

sorry for my bad english (french)
i hope i send you enough information.



Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 8, 64 bit
Processor: AMD A6-5200 APU with Radeon(TM) HD Graphics, AMD64 Family 22 Model 0 Stepping 1
Processor Count: 4
RAM: 7643 Mb
Graphics Card: AMD Radeon HD 8400, 512 Mb
Hard Drives: C: Total - 687418 MB, Free - 581852 MB; D: Total - 27195 MB, Free - 2710 MB;
Motherboard: Hewlett-Packard, 213B
Antivirus: Windows Defender, Disabled

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