Posted 08 September 2008 - 06:24 AM
Yes it can.
It can corrupt a running session, typically causing BSODs if faulty memory corrupts running code.
It can also cause corruption of the installation on the hard drive. A common cause would be the fact that writes to the hard drive are cached in RAM. Windows in the normal course of operation writes updates to vital system files like the registry, and if a RAM fault causes this to be corrupted, the operation of Windows can likewise be corrupted.
Another potential cause is something that makes changes to the storage system on the hard drive. Chkdsk and defrag can corrupt the contents of a drive if either is run on a system with faulty RAM.
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