Your 0x00000050 error is pretty generic and could be just about any bad hardware, bad RAM, bad driver, bad software, etc... So it is very hard to troubleshoot. Best take some time reading this general STOP message checklist:
http://www.aumha.org/win5/kbestop.php#general
As for 0x00000024. Here is what they say about that:
"A problem occurred within NTFS.SYS, the driver file that allows the system to read and write to NTFS file system drives. There may be a physical problem with the disk, or an Interrupt Request Packet (IRP) may be corrupted. Other common causes include heavy hard drive fragmentation, heavy file I/O, problems with some types of drive-mirroring software, or some antivirus software. I suggest running ChkDsk or ScanDisk as a first step; then disable all file system filters such as virus scanners, firewall software, or backup utilities. Check the file properties of NTFS.SYS to ensure it matches the current OS or SP version. Update all disk, tape backup, CD-ROM, or removable device drivers to the most current versions."
If your hardware is good, then you need some serious software work, and perhaps even reinstalling your commonly used programs and AV. Hard to tell. Without reading back through every post, you DID run memtest86 right? I think the big two to rule out are RAM and hard drive at this point.
You might consider removing any programs you don't use anymore, scan for viruses and spyware, delete any leftover files and such, clean your startups, turn off your pagefile, defrag the hard drive, do all your windows updates and patches, update all your drivers, turn pagefile back on at some point after defrag.
If you have SMART enabled on your hard drive (check BIOS), then you may want to download a Windows-based SMART checker to help monitor your hard drive stats.
Other then that, read through that STOP guide. And you can look up other STOP codes at the main page which is:
http://www.aumha.org/win5/kbestop.htm
good luck (P.S., you might go into advanced settings and make sure Windows is set to create a minidump. Rightclick My Computer-Properties-Advanced tab)