it sounds like some files/apps have been deleted or their entries removed from the registry.
i have this old computer but it runs fine for me for websurfing but sometimes it just stops doing what it's made for. when i open a programm like internet explorer 7.0 it doesn't show the tab bar and home icon as well as arrows. it also sometimes doesn't even start a programm like avast normally runs it fine but sometimes it just says "can't find the avast.exe file." it also crashes alot of time and restarts esspeacilly when i am playing a flash game on the internet. please help me find out which component in my pc is wrong or faulty and i should upgrade it. these are my specs:
Foxconn motherbaord 661FX7MI-S.
intel celeron D 2.0 GHz.
80 GB hatchi hardrive.
LG RW optical drive.
1280 GB RAM.
400 Watt power supply.
Windows XP SP2