How does this happen if i restore a system?

way back i restored the system in veiw of unnecessary updates that got into my sys.the system restore points were available only at that days when i installed new softwares.i restored the system and found that most of the softwares were gone and even the internet explorer setup module was also missing.....so i restored the sys again.in short "UNDOED" that ..and then the problem started ...most of the softwares were not there....so i tried to reinstall them ..but i could'nt ...every time i do get an error....by updating my sys to INTERNET 7 i could access the internet...but the internet based search softwares donot work...like ARES...can any body sort this thing out?