After you calm down, consider wiping the hard drive clean (via FDISK or
DISKPART), then re-create at least two partitions (OS+programs, data),
format them as appropriate (hint, FAT32 is more universal than NTFS),
disconnect all peripherals, except monitor, keyboard, and mouse, (be sure
internet connect is disconnected, too), update the BIOS, install the
operating system of your choice, install any drivers that came with the
motherboard.
Before installing any application software, make a backup of the system
partition. (You will have to install some backup software.) Next, test
recovery function of the backup software, assuming that the operating system
can not be booted. If you can not recover, get better backup software, or
read the manual more carefully.
Now, everytime you add a program or two OR do an update or two, and test
that everything is working OK, do another backup. If adding a
program/update messes things up, restore to before the problem. Yes, XP
updates can kill a PC. Not the update itself usually, but a slipped bit in
the download, more likely. This is true of XP, 98, etc. My worst disaster
in 98 was casued by a IE update that went wrong. The same update worked
fine a few days later.
As for choise of OS, I must honestly say that XP has been less problem for
me than 98 or 95. I tried Red hat 7.x LINUX, and that worked OK, but it was
limited in functions, and I never tried updating it. I have a friend who is
happy with Susse LINUX, if that helps.