|This does sound a little as paulsep suggests… a possible issue/problem with the wifi card in you HP?|
Is this HP under warranty/guarantee by chance? If so… suggest you have a serious word with the the folks where you bought it; even better go directly to HP support - and ask for a replacement unit?
If you do manage to get that far… first ensure you have copied all your personal "stuff" off the drive - before letting go on the laptop you have. Typically to toDVD. Check the copies of personal files etc. are truly accessible/readable on both the HP as is, and at least on your Dell system. Then keep the discs safe… You can then transfer the "stuff" to your replacement laptop later. And of course when you have good/saved copies - delete all that personal "stuff" off the HP.
Good/wise practice to have copies of personal files etc. on DVD (and/or another hard drive - external) at al times; just in-case you have problems at any time with the computer on which they are generally stored/used…
Incidentally this appears to be a fairly common problem - at least with HP - but Is suspect with other brands too.
are two of many discussions about it
Also are you sure you have posted here the correct model number etc for your laptop? I ask as I cannot find g42 365gtu on either the UK or USA HP support areas? There is a 367cl version but not the one you post…?
And are you running your laptop on battery only where you're having poor wifi - or is also poor when running on mains (ac-power)?