reinstalling Windows 98

Hello, i have problem with Windows 98,while entering in Windows,in the moment
when i put the password to enter in Win, it stucks,the password is
ok,everything is ok,but imidietly after that,i see the mouse cursor,but
stucked.
I have important programs installed in it,which i cannot find on
internet,they are licnced,i have also important data,so i cannot afford of
loosing any of them because i`1ll have to buy them again. My question is, if
i reinstall Windows 98 without formatiing,will i loose something from the
data and the programs?
i`m also not sure how to reinstall without formatiing,i have bootable Win 98
CD,but i was working with XP all the time,so i`m not sure if its same way
Win98 and XP.
thank you very much in advance