電腦上出現17個找不到服務器，曾經出現過40個！然後又死機！

一開機就出現很多警告:
1)The application has failed to start because MMVCP70.dll was not found. Re-installing the application may fix this problem;
2)The application on DLL C:\proGRA~1\Yahoo!\ASSIST~1\Assist\Ya*****ar.dll is not a valid windows image . Please check the against your installation diskette;
3)The exception unknow software exception (ox0070001)occurred in the application at location ox7c81eb33
4)Error loading C:\WINDOWS\downlo~1\CnsMin.dll Access is denied
終於打完了！請好心人用中文給以指教！真頭疼！！