Error Opening Output File

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I am running Songverter 1.003. OPSYS is Windows XP SP3, latest version of lame_enc.dll from MTU is installed. I have been converting some .kma files to *.zip mpg + cdg. It has worked fine for a while, although it does have the 508 limit, I'm not immediately concerned about that.

After converting some files successfully, all of a sudden I amd geting the following error: First, I get ERROR OPENING OUTPUT FILE, then upon clicking OK as that is my only option, I get
Microsoft Visual C++ Error-
c:\programfiles\microtechnologylimited\sonverter\songverter.exe
The Application has requested Runtime to terminate in an unusual way, Please contact the program vendor for more info.

I have plenty f room on the hard drive, I've even tried connecting an external drive and I get the same problem, I can find no errors on either hard drive.

PLEASE HELP