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My Samsung Galaxy 3 (GT-i5801) is not being detected by my PC — What should I do?

I have a Samsung Galaxy 3 (GT-i5801) Android enabled phone. Currently, my phone is not being detecting by my PC. Initially, when I purchased this phone, at that time I was developing applications and successful to run the applications on my phone. But nowadays, the phone is not being detecting by my PC. I have also purchased a new cable as I thought the data cable may have been damaged too.

What can be the possible solutions or what do I need to check for in order for connecting my Samsung Galaxy 3 to my PC by using a data/USB cable?

I have Windows XP installed on my Dell Inspiron laptop.

Update:

Please check the answer of JRC at below, the same problem he (and me also) is also getting.