Hi, I only have 1 usb asic miner so im new to mining. Its been mining for almost a week and this morning it started showing this error.

Im using cgminer 3.1.1 so i could you the -s COM# at the end which results in a few more hashes/s and its on Win XP

THis is the code  i use- cgminer-nogpu.exe -o eu-stratum.btcguild.com:3333 -u drinu16_1 -p 123 -S COM3

and this is the error
http://s14.postimg.org/4ph9lwdnl/Capture.png

I had installed this http://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx and its has been working with it since

What am i doing wrong ??

Im using BTC Guild and also tried it on another pc and still the same.