My immediate thoughts are that your computer specifications are very low for WIndows XP.
You have a 500 MHz processor, and 128MB RAM. Also you have 500MB free space on the C drive.
500 MHz processor is very slow nowadays. Intel processors on the market today are running at 3.0 GHz, 6 times faster than your processor.
Although Microsoft say that only 64MB or RAM is needed, many people find that at least 512MB of RAM is required, and many have even more. I have 2GB of RAM.
Your free space on the C drive is minimal. With today's XP programs taking up 200-300MB routinely, a lot more space is needed. Also, because XP needs more physical RAM, it also uses more Virtual RAM, (or the paging file). A minimum of 1? times physical RAM.
You may be able to set the paging file to run off other drives where you may have more space, but I don't see that will help as your processor and physical RAM will be needed to manage it, and the processor is very slow, making access times slow as well.
Sorry. But I think that those things may be the main cause of your problem.
I use a PIII - 500MHz/128RAM PC with Win XP installed on it. My system drive (C:\ ) has a decent 500MB free space. I have my voice chat applications installed on other drives . Every time I start to voice chat (Y!M, GTalk, Skype) my PC hangs after about 2 minutes. With GTalk it happens in about 1 minute.
I have no clue why this happens, the system just gets frozen and I cannot even move my mouse. The situation continues for I dont know how long, but I waited for about an hour once and I always have to reboot my machine.
FYI, I am doing voice chat on this PC for the first time
Can any one please help me?
Thanks in advance