Back to dial up days Grrrrrrrrrrrrrrrrrrrrrrr

Hi maxie, Yes can't believe it, as luck would have it I have been away from desktop computer for about 5 days (decorating mothers house) but have been using tablet/mobile phone etc, and wifi has been brilliant, but the hard wired awful, all morning cheesed off with buffering, so this afternoon sitting comfortable at desktop....................I made the call, ready for the termination of my contract, but lo & behold wind taken out of sails by the thinggymejig + reset, seems to have fixed it anyway will give it till Saturday.

Well I'm here again, today computer internet was buffering all day, so rang BT was on phone for an hour (0800 number), anyway got my Nexus 7 on wifi loading pages quickly, also my Galaxy S3 phone all loaded quickly, engineer was flummoxed same as me.
He suggested I hard wire my laptop, and woila everything perfect 73-78Mb d/load 10-15 U/load on Ookla Speedtest/wholesale test from BT, so where do I go from here, what is wrong with my PC? all help appreciated.

Hi maxie
Doing everything on laptop at the moment.
Scouring youtube for possible solutions, alas I probably haven't entered the correct terminology to get the answer.
I have disabled/uninstalled relevant drivers & updates, to no avail, so at the moment in a quandary!
I'm reluctant to run one of those fix everything bits of software, unless you with all your helpful over 15000 posts have come across some magic software, I can only think of malwarebytes & ccleaner,

Cheers.
Have done the cmd & ipconfig release/renew have pinged google.com no problems, have removed plug from wall socket held the pins to remove static electricity.........................nothing, still buffering like it's gone out of fashion.

Only when I removed plug from wall, other than that HH5 shows positive all day.
I've got to call it day now, have been puting for about 7 hours so obesity might creep up on me, so I'm going to sit somewher else.
Will be in touch. Thanks for your input.