Windows Xp Issues?? Start>Search>Files&Folders

I can't figure it out...Whenever I try to search in Start menu I get a Windows XP Error halfway through the search and My computer freezes and then I click "Send Error Report to Windows" So I do...

Also My computer has been Automatically Restarting itself or I get the BLUE SCREEN OF DEATH....Please Someone help me fix these issues??


Please Respond

Also I notice My Mozilla FireFox Has Issues...It sometimes freezes and I have to close it up and reopen a new browser to get back into the internet...How do I fix this as well??