Xcopy command not recognized

Hi there

i have been using the XCOPY command in a command window to back up data from one drive to another for many years. I have just recently tried and the coomand is no longer recognized.

Any thoughts anyone?

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows XP Home Edition, Service Pack 3, 32 bit
Processor: Intel(R) Pentium(R) Dual CPU E2220 @ 2.40GHz, x86 Family 6 Model 15 Stepping 13
Processor Count: 2
RAM: 3062 Mb
Graphics Card: Intel(R) 946GZ Express Chipset Family, 256 Mb
Hard Drives: C: Total - 143975 MB, Free - 97686 MB; D: Total - 161193 MB, Free - 36504 MB; H: Total - 112886 MB, Free - 68100 MB; N: Total - 171977 MB, Free - 49454 MB; O: Total - 8001 MB, Free - 7940 MB; P: Total - 125586 MB, Free - 27208 MB;
Motherboard: Foxconn, 946 7MA Series
Antivirus: Kaspersky Internet Security, Updated: Yes, On-Demand Scanner: Enabled