0x80070643 Fatal Error During Installation of PLEX Media Server Setup

Hi,
I had gotten a rather pesky virus and was finally able to flush it out thanks to Malware Bytes.  However, now nothing will install. 
Currently, I'm trying to install Plex Media Server, and I get the "0x80070643 Fatal Error During Install".
What can I do to undo this damage and get things to download smoothly again?
Just in case, here's a log of the last Plex install attempt:
[0184:1960][2014-04-10T13:10:58]i001: Burn v3.7.1224.0, Windows v6.1 (Build 7601: Service Pack 1), path: C:\Users\Michelle\Desktop\Downloads\Plex-Media-Server-0.9.907.429-f80a8d6-en-US.exe, cmdline: ''
[0184:1960][2014-04-10T13:10:58]i000: Initializing string variable 'InstallFolder' to value '[ProgramFilesFolder]Plex\Plex Media Server'
[0184:1960][2014-04-10T13:10:58]i000: Initializing string variable 'LaunchTarget' to value '[InstallFolder]\Plex Media Server.exe'
[0184:1960][2014-04-10T13:10:58]i000: Setting string variable 'WixBundleLog' to value 'C:\Users\Michelle\AppData\Local\Temp\Plex Media Server_20140410131058.log'
[0184:1960][2014-04-10T13:10:58]i000: Setting string variable 'WixBundleOriginalSource' to value 'C:\Users\Michelle\Desktop\Downloads\Plex-Media-Server-0.9.907.429-f80a8d6-en-US.exe'
[0184:1960][2014-04-10T13:10:58]i052: Condition '((VersionNT >= v5.1) AND (ServicePackLevel >= 3)) OR ((VersionNT >= v5.2) AND (ServicePackLevel >= 2)) OR (VersionNT >= v6.0)' evaluates to true.
[0184:1960][2014-04-10T13:10:58]i000: Setting string variable 'WixBundleName' to value 'Plex Media Server'
[0184:1960][2014-04-10T13:10:58]i100: Detect begin, 1 packages
[0184:1960][2014-04-10T13:10:58]i101: Detected package: pms, state: Absent, cached: None
[0184:1960][2014-04-10T13:10:58]i199: Detect complete, result: 0x0
[0184:1960][2014-04-10T13:11:02]i200: Plan begin, 1 packages, action: Install
[0184:1960][2014-04-10T13:11:02]i000: Setting string variable 'WixBundleRollbackLog_pms' to value 'C:\Users\Michelle\AppData\Local\Temp\Plex Media Server_20140410131058_0_pms_rollback.log'
[0184:1960][2014-04-10T13:11:02]i000: Setting string variable 'WixBundleLog_pms' to value 'C:\Users\Michelle\AppData\Local\Temp\Plex Media Server_20140410131058_0_pms.log'
[0184:1960][2014-04-10T13:11:02]i201: Planned package: pms, state: Absent, default requested: Present, ba requested: Present, execute: Install, rollback: Uninstall, cache: Yes, uncache: No, dependency: Register
[0184:1960][2014-04-10T13:11:02]i299: Plan complete, result: 0x0
[0184:1960][2014-04-10T13:11:02]i300: Apply begin
[17F4:1200][2014-04-10T13:11:08]i360: Creating a system restore point.
[17F4:1200][2014-04-10T13:11:29]i361: Created a system restore point.
[17F4:1200][2014-04-10T13:11:29]i000: Caching bundle from: 'C:\Users\Michelle\AppData\Local\Temp\{e9921c42-812d-4b39-9c02-612724349e82}\.be\pms.exe' to: 'C:\ProgramData\Package Cache\{e9921c42-812d-4b39-9c02-612724349e82}\pms.exe'
[17F4:1200][2014-04-10T13:11:30]i320: Registering bundle dependency provider: {e9921c42-812d-4b39-9c02-612724349e82}, version: 0.9.907.0
[17F4:1618][2014-04-10T13:11:32]i305: Verified acquired payload: pms at path: C:\ProgramData\Package Cache\.unverified\pms, moving to: C:\ProgramData\Package Cache\{69D8C4EA-5363-48FB-AB13-5F8FF61DF7C3}v0.9.907\pms.msi.
[17F4:1200][2014-04-10T13:11:32]i323: Registering package dependency provider: {69D8C4EA-5363-48FB-AB13-5F8FF61DF7C3}, version: 0.9.907, package: pms
[17F4:1200][2014-04-10T13:11:32]i301: Applying execute package: pms, action: Install, path: C:\ProgramData\Package Cache\{69D8C4EA-5363-48FB-AB13-5F8FF61DF7C3}v0.9.907\pms.msi, arguments: ' ARPSYSTEMCOMPONENT="1" MSIFASTINSTALL="7" INSTALLLOCATION="C:\Program
Files (x86)\Plex\Plex Media Server"'
[17F4:1200][2014-04-10T13:13:26]e000: Error 0x80070643: Failed to install MSI package.
[17F4:1200][2014-04-10T13:13:26]e000: Error 0x80070643: Failed to execute MSI package.
[0184:1960][2014-04-10T13:13:26]e000: Error 0x80070643: Failed to configure per-machine MSI package.
[0184:1960][2014-04-10T13:13:26]i319: Applied execute package: pms, result: 0x80070643, restart: None
[0184:1960][2014-04-10T13:13:26]e000: Error 0x80070643: Failed to execute MSI package.
[17F4:1200][2014-04-10T13:13:26]i318: Skipped rollback of package: pms, action: Uninstall, already: Absent
[0184:1960][2014-04-10T13:13:26]i319: Applied rollback package: pms, result: 0x0, restart: None
[17F4:1200][2014-04-10T13:13:26]i329: Removed package dependency provider: {69D8C4EA-5363-48FB-AB13-5F8FF61DF7C3}, package: pms
[17F4:1200][2014-04-10T13:13:26]i351: Removing cached package: pms, from path: C:\ProgramData\Package Cache\{69D8C4EA-5363-48FB-AB13-5F8FF61DF7C3}v0.9.907\
[17F4:1200][2014-04-10T13:13:26]i330: Removed bundle dependency provider: {e9921c42-812d-4b39-9c02-612724349e82}
[17F4:1200][2014-04-10T13:13:26]i352: Removing cached bundle: {e9921c42-812d-4b39-9c02-612724349e82}, from path: C:\ProgramData\Package Cache\{e9921c42-812d-4b39-9c02-612724349e82}\
[0184:1960][2014-04-10T13:13:26]i399: Apply complete, result: 0x80070643, restart: None, ba requested restart:  No
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Hi,
Make sure you have turned on Windows Firewall:
1. Click the Start button. In the search box, type Windows Firewall, and then, in the list of results, click
Windows Firewall.
2. In the navigation pane, click Turn Windows Firewall on or off.
3. For each group of settings shown, select Turn on Windows Firewall, and then click
OK.
After that, download and install again. If the issue still persists, try to run
sfc /scannow command to repair the system for test:
Use the System File Checker tool to repair missing or corrupted system files
http://support.microsoft.com/kb/929833
Karen Hu
TechNet Community Support