Call immediately warning from Microsoft

I keep getting a strange warning when I am using Firefox. See attached screen shot.

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft® Windows Vista™ Home Premium, Service Pack 2, 32 bit
Processor: Genuine Intel(R) CPU T2250 @ 1.73GHz, x86 Family 6 Model 14 Stepping 8
Processor Count: 2
RAM: 2549 Mb
Graphics Card: Mobile Intel(R) 945GM Express Chipset Family, 224 Mb
Hard Drives: C: Total - 112971 MB, Free - 38974 MB;
Motherboard: TOSHIBA, IAKAA
Antivirus: AVG AntiVirus Free Edition 2015, Updated and Enabled

Attached Images

firewall Warning.jpg (119.8 KB)