meray computer main ajeeb se problem ho gaee hay///

system kuch din say dead slow that main nay xp windows install ke tb say masla ya a raha hay k net say kuch bhe download karon to 99.9% pay ja k sab downlodes ruk jatee hay...in process he show karta rahta hay...agr usb say kuch install kar lo firefox wegera to wo open nahin karta...or agar internet explorer use karoo to system kuch deir tk stuck ho jata hay and showing error "send error detail ....dont send""


please experts help me how to resolve the issue