BSOD happens randomly (multiple errors) 0x000000D1

Hi,
I never post in forums, but i saw how helpful ppl here were so i thot i'd give it a shot. I was honestly ready to throw this pc into the dumpster so any help I can get will be greatly appreciated.

This is my gf's custom pc she built herself about 6 years ago. I has been used and abused by her siblings. It was having all kinds of problems so she had a friend look at it and clean everything inside. It was still crashing so I reformatted and reloaded the OS, trying to just get a clean start. Although, the issue of crashing has been improved through this, it is not cured.

I get BSOD while playing games, surfing the web, while sitting idle, after coming back from sleep, pretty much anytime. Sometimes I get no BSOD for hours, other times its more constant.

I am pretty much a tech noob and ive tried everything i know of. Anymore info that is needed plz tell me and I will post it. Thanks for taking the time to help me out, id really love to save this PC

Thank you

sometimes it says DRIVER_IRQL_NOT_LESS_OR_EQUAL
usually usbport.sys / nvlddmkm.sys
and usually 0x000000D1

Can you remove the Belkin USB Wireless Adapter and use the nvidia nforce networking Controller (wired) Just for testing, see if you get any more BSOD. Post the dumps here if you do.

Thanks

Can you update your gfx driver: NVIDIA GeForce GTS 250 Drivers - Download NVIDIA Drivers