You seem to be dealing with multiple issues here. The part about the locked SIM is easy, you need to talk to the cellphone provider and get the unlock code. There are also software packages available to unlock various models of phones, but I'd do the free option first if it's available. FYI, I found a package for $3.99 on eBay that unlocked my RAZR, pretty painless. 
Before anyone comments on the legality of unlocking the SIM on your phone:[WEBQUOTE="http://en.wikipedia.org/wiki/SIM_lock"]In the United States under new copyright rules, cellular phone unlocking is now legal. The new rules took effect November 27, 2006 and will expire in three years.[/WEBQUOTE]
The MP3 player issue is a bit more complex. First thing to try.
Right click My Computer, Properties, Device Manager. Remove all the unknown devices, any recognizable entries for either of these devices, and all the stuff under USB Controllers. Reboot, let Windows discover the USB controllers again, and see if the driver installs work.
W98SE is a bit picky about USB devices, and you seem to have somehow corrupted the registry entries for both the old and new devices. If the previous solution didn't work, the solution is probably going to involve editing the registry to remove all the entries for the two devices and then following the proper procedure to install them again. The drivers in question will appear in the HKEY_LOCAL_MACHINE/Enum key. The bad news is this is a pretty tricky operation, and without actually seeing the registry entries, I don't have specific instructions for fixing this one.
Before anyone comments on the legality of unlocking the SIM on your phone:[WEBQUOTE="http://en.wikipedia.org/wiki/SIM_lock"]In the United States under new copyright rules, cellular phone unlocking is now legal. The new rules took effect November 27, 2006 and will expire in three years.[/WEBQUOTE]
The MP3 player issue is a bit more complex. First thing to try.
Right click My Computer, Properties, Device Manager. Remove all the unknown devices, any recognizable entries for either of these devices, and all the stuff under USB Controllers. Reboot, let Windows discover the USB controllers again, and see if the driver installs work.
W98SE is a bit picky about USB devices, and you seem to have somehow corrupted the registry entries for both the old and new devices. If the previous solution didn't work, the solution is probably going to involve editing the registry to remove all the entries for the two devices and then following the proper procedure to install them again. The drivers in question will appear in the HKEY_LOCAL_MACHINE/Enum key. The bad news is this is a pretty tricky operation, and without actually seeing the registry entries, I don't have specific instructions for fixing this one.