virus infected?

when i turn on to start pc, my default homepage has been changed to a weired page with many ads and others. and it pops up ads from time to time when surfing the internet. in the favorites, it automatically adds many junk page bookmarks.
i am using windows-xp.
questions:
1). is it virus infected?
2). how to get rid of the bookmarks in favorites folders.
3). how to clean the virus?
Thanks a lot!

所有跟帖： 

• 回复：virus infected? -自由飞- ♀ (221 bytes) () 07/27/2004 postreply 14:50:25

• 回复：回复：virus infected? -pc_down12- ♀ (126 bytes) () 07/27/2004 postreply 15:06:57

• 回复：回复：回复：virus infected? -自由飞- ♀ (33 bytes) () 07/27/2004 postreply 15:08:45