unable to connect Sansa to my laptop...HELP


I own Sansa@Clip 1 GB MP3 player.Initially my laptop had XP home edition and SP 2,my MP3 was working perfectly fine.I use to get sansa player folder in MY Computer whenever I connect it to my USB port.

Then I upgraded my laptop to XP professional and SP 3, now my MP 3 is not being able to connect to my laptop,neither I am getting  sansa player folder in My Computer,

I am not being able to charge my MP3 or add music.

Please help whats the problem,Initially it was working so good,after my upgrade it stopped working.

Also I have windows media player 11,and has all the requirements I think. 

Thank You