How viruses can effect are computer??
Der will b verious type of viruses some r milisius to affect on pc n also malware ,trojan etc some virus currupt ur files n data some will b make duplicate copy of data....
By untrusted apps.
When we install the untrusted apps or files
Slow prcess on ur pc
Os corrupt file and show message
are you a IT studnt?
first of all viruses are all programs which are made to create problems in our normal wrks. this programs are of various types (like trojan), some are which wil slow ur computr, some are called data theif coz thy steal all the documnts nd files frm ur computr, some are used to hack computr also..so this viruses are of various types dependng on the purpose for wch thy are made..to knw in details about it you can srch in google
Damage or infact programme
Duplicate copy any file
System shutdown , slow procces, error messages,
File currepat,file delete etc..