OT: Odd system folders!

[Atrocities]

My PC has been running slow as of late, no viruses or spy ware could be found. However today I found a few new files on my C-Drive. Can any one tell me what they are?

I googled msxml4-KB927978-enu and it came back as something to do with MS update. I opened the file and its filled with line after line of code.

=== Verbose logging started: 1/10/2007 14:13:59 Build type: SHIP UNICODE 3.01.4000.2435 Calling process: C:\WINDOWS\system32\msiexec.exe ===
MSI (c) (E4:58) [14:13:59:703]: Resetting cached policy values
MSI (c) (E4:58) [14:13:59:703]: Machine policy value 'Debug' is 0
MSI (c) (E4:58) [14:13:59:703]: ******* RunEngine:
******* Product: c:\1b1437b60fa92dc53ba15894\msxml.msi
******* Action:
******* CommandLine: **********
MSI (c) (E4:58) [14:13:59:703]: Client-side and UI is none or basic: Running entire install on the server.
MSI (c) (E4:58) [14:13:59:703]: Grabbed execution mutex.
MSI (c) (E4:58) [14:14:00:703]: Cloaking enabled.
MSI (c) (E4:58) [14:14:00:703]: Attempting to enable all disabled priveleges before calling Install on Server
MSI (c) (E4:58) [14:14:00:703]: Incrementing counter to disable shutdown. Counter after increment: 0
MSI (s) (E4:48) [14:14:00:750]: Grabbed execution mutex.
MSI (s) (E4:AC) [14:14:00:750]: Resetting cached policy values
MSI (s) (E4:AC) [14:14:00:750]: Machine policy value 'Debug' is 0
MSI (s) (E4:AC) [14:14:00:750]: ******* RunEngine:
******* Product: c:\1b1437b60fa92dc53ba15894\msxml.msi