As the title suggests, that is exactly how long Oblivion will run on Vista Ultimate, and it's the GOTY edition of TES4.
Had the game for a full year now, didn't have this issue before, but now the game will only let me play for a maximum of 5mins.
I ran it as Administrator: same thing.
Tried nearly every Compatibility setting: same.
Uninstalled & Reinstalled: Same.
Turned off unnecessary processes: Same.
That file that caused oblivion to crash isn't on my pc (mped2dmx something file).
Updated everything as best I could, even did manual updates from the microsoft site: same.
And before you ask, The game is bought an paid for from Fred Meyer, no cracks or whatever (saw a post where an admin or member asked that question, and no that post is NOT related to my issue).
I called tech support for TES4, they told me that it isn't designed for vista, which I knew for a fact that it does work with it. So please, if ANYONE knows how to fix this really annoying issue (And yeah the game is installed with updates), please let me know.

And just in case anyone asks:
Biostar MotherBoard PCI Express
3.20 ghz P4 Processor
3 gbs of Ram (Crucial Balistics)
160 gb Hard Drive (dunno the brand)
Dell Optical Mouse & Dell Keyboard (if that matters)
Built in Sound Device (so no sound card needed)
Nvidia 8600 GT (Funny that it ran on my previous 5900 FX, but not this one)
Windows Vista Ultimate 32bit (With The Service Packs)

The game ran ok with my previous hardware, but now oddly it doesnt want to run at all. The weird this is, it doesn't crash or freeze or kick back to desktop, it just disables my mouse and keyboard after 5 mins of playing. The game still goes on, my character still slowly moving (showing that hes breathing) and with a rat walking back and forth, I haven't made it out of the first Dungeon of the game yet!

Seriously, help me here. And if you guys need a DXdiag, you'll need to tell me how to create one to send to you guys, haven't figured that thing out yet.
And for further overkill, did Scan Disk, Defrag, MemTest, and virus scanning, still the same issue. No BSOD, if you are curious. If theres anything that you guys can tell me that'll get my game working, PLEASE help me out. Thanks in advance.
Pm me if I take too long to respond, I always check my emails, but I'm joined with so many sites that I usually lose track, thats another just in case. Thanks alot to everyone that helps out!

Gyrannon