BACK arrow causes my computer to freeze

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 32 bit
Processor: Pentium(R) Dual-Core CPU T4300 @ 2.10GHz, x64 Family 6 Model 23 Stepping 10
Processor Count: 2
RAM: 3032 Mb
Graphics Card: Mobile Intel(R) 4 Series Express Chipset Family, 1292 Mb
Hard Drives: C: Total - 193472 MB, Free - 113401 MB; D: Total - 29690 MB, Free - 28932 MB; E: Total - 15000 MB, Free - 14385 MB;
Motherboard: LENOVO, NITU1
Antivirus: Microsoft Security Essentials, Updated and Enabled