5 of 7 title clarification

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

I am having Samsung Galaxy 3(GT-i5801) Android enabled phone. Currently, my phone is not being detecting in my PC, initially when i have purchased this phone, at that time i was developing applications and successful to run the applications on my phone. But now days, phone is not being detecting by my pc. I have also purchased new cable as i doubted the data cable that it may be damaged so.

What can be the possible solutions or what i needs to check for connecting my samsung galaxy 3 to my PC by using Data/USB Cable?

I am having Windows XP in my DELL Inspiron Laptop.

Please give me possible Solutions.

Thanx

Update:

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