Nope, its 100% home built custom gaming computer the specs are as follows:
Intel i7 2600k @ 4.7GHz
Corsair Vengeance 8GB @ 1600Mhz
Corsair 650D (case)
Corsair H80 (Cpu Cooler)
Corsair FORCE 120GB SSD
Corsiar HX850 850w PSU
Intel 330 Series 60GB SSD
Asus P8Z77-V Motherboard
EVGA GeForce GTX680 Super Clock 2GB @1125Mhz
Windows 7 Home Premium
I'm going to take a stab and guess that "TIN" stands for some kind of a temperature probe nomenclature.
Then the CPUTIN is a temperature probe monitoring the CPU temperature. Check to see if increases in this value is correlated with CPU Core temperature, if it does, it means that it is an additional sensor located somewhere underneath the CPU on the motherboard. A lot of motherboards come with at least 1 additional CPU temperature sensor, internally calibrated so the BIOS can shut down the system if the CPU temperature exceeds some value. This is independent of the CPU Die sensors, which are actually on the CPU dies.
The SYSTIN would be the motherboard temperature sensor, usually located close to the VRMs, unless you have independent VRM temperature read outs.
The AUXTIN could be a back up sensor of some sort, used to compute ambient temperatures when primary sensors are not available or have failed.
I have no idea what the other 2 could be referring to. HWMonitor gets these names by enumerating the system management bus and querying the values given. It doesn't know for sure what these might be either. Some values like CPU die temperatures or GPU die temperatures are independent of motherboard manufacturers because they physically reside in the CPU or GPU. However, a lot of CPU temperature values (AMD Phenom II's the most recent example) have an ill-calibrated CPU Die temperature sensor which yields absurd values (like CPU die temperature < ambient room temperatures) when read without compensation. AMD has acknowledged this, and said that this was intentional.
That's my best GUESS at what those fields are. You could always do a super-close up examination of the board to see where the thermal probes (tiny little surface mounted chips) are, and if there are any corresponding labellings of them.