Upgrade trouble

I am having trouble with the upgrade of Acronis True Image Home 2011 to the newest version.

I've been frequently checking for TIH 2011 updates ever since they introduce the issue where your configured SMTP server requires authentication and the one I am using does not do authentication.

So today I saw they have an update.  I went ahead and decided to run the update.  I just checked back after about 40 minutes, and my install was only about 1/3 the way through.  I decided to wait a bit and see if it was moving, and it was not.  I turned off my on-access anti-virus scanner, but this had no effect.

I decided to look in the Windows Event Viewer, and I did find some Information messages that may indicate what could be causing the issue:

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Log Name:      Application
Source:        MsiInstaller
Date:          2/14/2011 9:06:17 PM
Event ID:      1025
Task Category: None
Level:         Information
Keywords:      Classic
User:          hostname\username
Computer:      hostname
Description:
Product: Acronis True Image Home 2011. The file C:\Program Files (x86)\Acronis\TrueImageHome\x64\versions_page.dll is being used by the following process: Name: explorer , Id 4808.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MsiInstaller" />
    <EventID Qualifiers="0">1025</EventID>
    <Level>4</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2011-02-15T02:06:17.000000000Z" />
    <EventRecordID>20436</EventRecordID>
    <Channel>Application</Channel>
    <Computer>hostname</Computer>
    <Security UserID="S-1-5-21-2626302321-2836749625-3976135476-1001" />
  </System>
  <EventData>
    <Data>Acronis True Image Home 2011</Data>
    <Data>C:\Program Files (x86)\Acronis\TrueImageHome\x64\versions_page.dll</Data>
    <Data>explorer</Data>
    <Data>4808</Data>
    <Data>(NULL)</Data>
    <Data>(NULL)</Data>
    <Data>
    </Data>
    <Binary>7B30344133413642302D384531392D343942422D383246462D3635433541353546393137447D</Binary>
  </EventData>
</Event>

-------

Log Name:      Application
Source:        MsiInstaller
Date:          2/14/2011 9:06:17 PM
Event ID:      1025
Task Category: None
Level:         Information
Keywords:      Classic
User:          hostname\username
Computer:      hostname
Description:
Product: Acronis True Image Home 2011. The file C:\Program Files (x86)\Acronis\TrueImageHome\tishell64.dll is being used by the following process: Name: explorer , Id 4808.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MsiInstaller" />
    <EventID Qualifiers="0">1025</EventID>
    <Level>4</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2011-02-15T02:06:17.000000000Z" />
    <EventRecordID>20435</EventRecordID>
    <Channel>Application</Channel>
    <Computer>hostname</Computer>
    <Security UserID="S-1-5-21-2626302321-2836749625-3976135476-1001" />
  </System>
  <EventData>
    <Data>Acronis True Image Home 2011</Data>
    <Data>C:\Program Files (x86)\Acronis\TrueImageHome\tishell64.dll</Data>
    <Data>explorer</Data>
    <Data>4808</Data>
    <Data>(NULL)</Data>
    <Data>(NULL)</Data>
    <Data>
    </Data>
    <Binary>7B30344133413642302D384531392D343942422D383246462D3635433541353546393137447D</Binary>
  </EventData>
</Event>

-------

These seemed to be related to the explorer.exe process locking files, so I used taskmgr.exe to kill all explorer.exe processes.  However, this made no difference.  I pressed the cancel button, and after a short delay it asked if I wanted to cancel the installation to which I answered yes.  However, it is still stuck on the installation progress window and it is about 10 minutes since I asked it to cancel the installation.

Any ideas?  I'm hesitant to outright terminate the install because I get the feeling that I won't be able to get the product properly installed.

OS: Windows 7 Ultimate x64
CPU: Intel Core 2 Quad Q6600
RAM: 4 GB DDR-800 running in dual-channel mode
Motherboard: Gigabyte EP43-UD3L (Intel P45 chipset)
Video card: eVGA nVidia 8800 GTS 320 MB
Hard drives:  1x 500 GB Western Digital Black 7,200 rpm SATAII 32 MB cache (OS and application volume) and 1x 500 GB Samsung Spinpoint 7,200 rpm SATAII 16 MB cache (data volume)
Windows Experience Index: 5.9