I've just started having a big overheating problem since last night. My computer froze up on me for no reason, then when I finally get it to come back on I check speedfan and see that that a "remote" sensor is registering over 100 celsius. Now I have no idea what this is, it's not the CPU, video card, RAM, or my hard drive. Could someone please help me?

Also my computer shuts off after opening too many programs, which it use to be able to run the amount I open. When it first shut off I was just doing regular stuff like listening to music, checking email, etc.

Speedfan isn't always accurate. Check the temp readings in the BIOS or try a different software program.

Try OCCT. It's used for monitoring & load testing plus it displays some system info. Download & install it, then click the desktop icon to fire it up. See what your CPU temp is at idle, then click GO to start load testing. Watch the CPU temp climb...see if it locks up.

http://www.ocbase.com/perestroika_e...

A failing power supply can cause a huge amount of heat to build up inside the case if it's fan(s) stop(s) spinning or spin too slowly.
How fast it is supposed to spin depends on the model.
El-cheapo PSs often have one 80mm fan that is supposed to spin full speed all the time.
Better PSs have better heatsinks so the PS inherently runs cooler, and often have an automatic variable speed control on one or more fans - the fan(s) spin(s) faster only when the PS has more load on it and gets hotter - that's normal for that situation.
The important thing is whether the PS is getting too hot - if it is it will eventually malfunction and fail.
See response 4 in this and check for obvious symptoms your PS is overheating:
http://www.computing.net/answers/ha...
......

If that doesn't help, try loading Optimal Defaults in the bios Setup - you may have overclocked something too much, or set the cpu core voltage too high.

e.g. this guy had up to a 118 C cpu temp until he reset the bios to Optimal defaults:
http://www.computing.net/answers/ha...